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PS08: Roadway Service Patrols

This service package supports roadway service patrol vehicles that monitor roads and aid motorists, offering rapid response to minor incidents (flat tire, accidents, out of gas) to minimize disruption to the traffic stream. If problems are detected, the roadway service patrol vehicles will provide assistance to the motorist (e.g., push a vehicle to the shoulder or median). The service package monitors service patrol vehicle locations and supports vehicle dispatch to identified incident locations. Incident information collected by the service patrol is shared with traffic, maintenance and construction, and traveler information systems.

Relevant Regions: Australia, Canada, European Union, and United States

Enterprise

Development Stage Roles and Relationships

Installation Stage Roles and Relationships

Operations and Maintenance Stage Roles and Relationships
(hide)

Source Destination Role/Relationship
Emergency Management Center MaintainerEmergency Management Center Maintains
Emergency Management Center ManagerEmergency Management Center Manages
Emergency Management Center OwnerEmergency Management Center Maintainer System Maintenance Agreement
Emergency Management Center OwnerEmergency Management Center Manager Operations Agreement
Emergency Management Center SupplierEmergency Management Center Owner Warranty
Emergency PersonnelEmergency Vehicle OBE Operates
Emergency Vehicle OBE MaintainerEmergency Vehicle OBE Maintains
Emergency Vehicle OBE ManagerEmergency Personnel System Usage Agreement
Emergency Vehicle OBE ManagerEmergency Vehicle OBE Manages
Emergency Vehicle OBE OwnerEmergency Vehicle OBE Maintainer System Maintenance Agreement
Emergency Vehicle OBE OwnerEmergency Vehicle OBE Manager Operations Agreement
Emergency Vehicle OBE OwnerTraffic Management Center Maintainer Maintenance Data Exchange Agreement
Emergency Vehicle OBE OwnerTraffic Management Center Owner Expectation of Data Provision
Emergency Vehicle OBE OwnerTraffic Management Center User Service Usage Agreement
Emergency Vehicle OBE OwnerTraffic Operations Personnel Application Usage Agreement
Emergency Vehicle OBE OwnerTraffic Operations Personnel Vehicle Operating Agreement
Emergency Vehicle OBE SupplierEmergency Vehicle OBE Owner Warranty
Maint and Constr Management Center MaintainerMaint and Constr Management Center Maintains
Maint and Constr Management Center ManagerMaint and Constr Management Center Manages
Maint and Constr Management Center OwnerMaint and Constr Management Center Maintainer System Maintenance Agreement
Maint and Constr Management Center OwnerMaint and Constr Management Center Manager Operations Agreement
Maint and Constr Management Center SupplierMaint and Constr Management Center Owner Warranty
Traffic Management Center MaintainerTraffic Management Center Maintains
Traffic Management Center ManagerTraffic Management Center Manages
Traffic Management Center ManagerTraffic Operations Personnel System Usage Agreement
Traffic Management Center OwnerEmergency Management Center Maintainer Maintenance Data Exchange Agreement
Traffic Management Center OwnerEmergency Management Center Owner Information Provision Agreement
Traffic Management Center OwnerEmergency Management Center User Service Usage Agreement
Traffic Management Center OwnerEmergency Personnel Application Usage Agreement
Traffic Management Center OwnerEmergency Vehicle OBE Maintainer Maintenance Data Exchange Agreement
Traffic Management Center OwnerEmergency Vehicle OBE Owner Information Provision Agreement
Traffic Management Center OwnerEmergency Vehicle OBE User Service Usage Agreement
Traffic Management Center OwnerMaint and Constr Management Center Maintainer Maintenance Data Exchange Agreement
Traffic Management Center OwnerMaint and Constr Management Center Owner Information Provision Agreement
Traffic Management Center OwnerMaint and Constr Management Center User Service Usage Agreement
Traffic Management Center OwnerTraffic Management Center Maintainer System Maintenance Agreement
Traffic Management Center OwnerTraffic Management Center Manager Operations Agreement
Traffic Management Center OwnerTransportation Information Center Maintainer Maintenance Data Exchange Agreement
Traffic Management Center OwnerTransportation Information Center Owner Information Provision Agreement
Traffic Management Center OwnerTransportation Information Center User Service Usage Agreement
Traffic Management Center SupplierTraffic Management Center Owner Warranty
Traffic Operations PersonnelTraffic Management Center Operates
Transportation Information Center MaintainerTransportation Information Center Maintains
Transportation Information Center ManagerTransportation Information Center Manages
Transportation Information Center OwnerTransportation Information Center Maintainer System Maintenance Agreement
Transportation Information Center OwnerTransportation Information Center Manager Operations Agreement
Transportation Information Center SupplierTransportation Information Center Owner Warranty

Physical

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Includes Physical Objects:

Physical Object Class Description
Emergency Management Center Center The 'Emergency Management Center' represents systems that support incident management, disaster response and evacuation, security monitoring, and other security and public safety-oriented ITS applications. It includes the functions associated with fixed and mobile public safety communications centers including public safety call taker and dispatch centers operated by police (including transit police), fire, and emergency medical services. It includes the functions associated with Emergency Operations Centers that are activated at local, regional, state, and federal levels for emergencies and the portable and transportable systems that support Incident Command System operations at an incident. This Center also represents systems associated with towing and recovery, freeway service patrols, HAZMAT response teams, and mayday service providers. It manages sensor and surveillance equipment used to enhance transportation security of the roadway infrastructure (including bridges, tunnels, interchanges, and other key roadway segments) and the public transportation system (including transit vehicles, public areas such as transit stops and stations, facilities such as transit yards, and transit infrastructure such as rail, bridges, tunnels, or bus guideways). It provides security/surveillance services to improve traveler security in public areas not a part of the public transportation system. It monitors alerts, advisories, and other threat information and prepares for and responds to identified emergencies. It coordinates emergency response involving multiple agencies with peer centers. It stores, coordinates, and utilizes emergency response and evacuation plans to facilitate this coordinated response. Emergency situation information including damage assessments, response status, evacuation information, and resource information are shared The Emergency Management Center also provides a focal point for coordination of the emergency and evacuation information that is provided to the traveling public, including wide-area alerts when immediate public notification is warranted. It tracks and manages emergency vehicle fleets using real-time road network status and routing information from the other centers to aid in selecting the emergency vehicle(s) and routes, and works with other relevant centers to tailor traffic control to support emergency vehicle ingress and egress, implementation of special traffic restrictions and closures, evacuation traffic control plans, and other special strategies that adapt the transportation system to better meet the unique demands of an emergency.
Emergency Personnel Vehicle 'Emergency Personnel' represents personnel that are responsible for police, fire, emergency medical services, towing, service patrols, and other special response team (e.g., hazardous material clean-up) activities at an incident site. These personnel are associated with the Emergency Vehicle during dispatch to the incident site, but often work independently of the Emergency Vehicle while providing their incident response services.
Emergency Vehicle OBE Vehicle The 'Emergency Vehicle On-Board Equipment' (OBE) resides in an emergency vehicle and provides the processing, storage, and communications functions that support public safety-related connected vehicle applications. It represents a range of vehicles including those operated by police, fire, and emergency medical services. In addition, it represents other incident response vehicles including towing and recovery vehicles and freeway service patrols. It includes two-way communications to support coordinated response to emergencies. A separate 'Vehicle OBE' physical object supports the general vehicle safety and driver information capabilities that apply to all vehicles, including emergency vehicles. The Emergency Vehicle OBE supplements these general capabilities with capabilities that are specific to emergency vehicles.
Maint and Constr Management Center Center The 'Maint and Constr Management Center' monitors and manages roadway infrastructure construction and maintenance activities. Representing both public agencies and private contractors that provide these functions, this physical object manages fleets of maintenance, construction, or special service vehicles (e.g., snow and ice control equipment). The physical object receives a wide range of status information from these vehicles and performs vehicle dispatch, routing, and resource management for the vehicle fleets and associated equipment. The physical object participates in incident response by deploying maintenance and construction resources to an incident scene, in coordination with other center physical objects. The physical object manages equipment at the roadside, including environmental sensors and automated systems that monitor and mitigate adverse road and surface weather conditions. It manages the repair and maintenance of both non-ITS and ITS equipment including the traffic controllers, detectors, dynamic message signs, signals, and other equipment associated with the roadway infrastructure. Weather information is collected and fused with other data sources and used to support advanced decision support systems. The physical object remotely monitors and manages ITS capabilities in work zones, gathering, storing, and disseminating work zone information to other systems. It manages traffic in the vicinity of the work zone and advises drivers of work zone status (either directly at the roadside or through an interface with the Transportation Information Center or Traffic Management Center physical objects.) Construction and maintenance activities are tracked and coordinated with other systems, improving the quality and accuracy of information available regarding closures and other roadway construction and maintenance activities.
Traffic Management Center Center The 'Traffic Management Center' monitors and controls traffic and the road network. It represents centers that manage a broad range of transportation facilities including freeway systems, rural and suburban highway systems, and urban and suburban traffic control systems. It communicates with ITS Roadway Equipment and Connected Vehicle Roadside Equipment (RSE) to monitor and manage traffic flow and monitor the condition of the roadway, surrounding environmental conditions, and field equipment status. It manages traffic and transportation resources to support allied agencies in responding to, and recovering from, incidents ranging from minor traffic incidents through major disasters.
Traffic Operations Personnel Center 'Traffic Operations Personnel' represents the people that operate a traffic management center. These personnel interact with traffic control systems, traffic surveillance systems, incident management systems, work zone management systems, and travel demand management systems. They provide operator data and command inputs to direct system operations to varying degrees depending on the type of system and the deployment scenario.
Transportation Information Center Center The 'Transportation Information Center' collects, processes, stores, and disseminates transportation information to system operators and the traveling public. The physical object can play several different roles in an integrated ITS. In one role, the TIC provides a data collection, fusing, and repackaging function, collecting information from transportation system operators and redistributing this information to other system operators in the region and other TICs. In this information redistribution role, the TIC provides a bridge between the various transportation systems that produce the information and the other TICs and their subscribers that use the information. The second role of a TIC is focused on delivery of traveler information to subscribers and the public at large. Information provided includes basic advisories, traffic and road conditions, transit schedule information, yellow pages information, ride matching information, and parking information. The TIC is commonly implemented as a website or a web-based application service, but it represents any traveler information distribution service.

Includes Functional Objects:

Functional Object Description Physical Object
EV Service Patrol Vehicle Operations 'EV Service Patrol Vehicle Operations' provides on-board processing and communications to service patrol vehicles that reduce response times and improve safety of responding personnel. It supports service patrol vehicle dispatch and provides incident information back to the dispatching center. Emergency Vehicle OBE
TMC Service Patrol Management 'TMC Service Patrol Management' supports dispatch and communication with service patrol vehicles that monitor roads to aid motorists, offering rapid response to minor incidents. Traffic Management Center

Includes Information Flows:

Information Flow Description
emergency personnel information presentation Presentation of information to emergency personnel in the field including dispatch information, incident information, current road network conditions, device status, and other supporting information.
emergency personnel input User input from emergency personnel in the field including dispatch coordination, incident status information, and remote device control requests.
emergency vehicle tracking data The current location and operating status of the emergency vehicle.
incident information Notification of existence of incident and expected severity, location, time and nature of incident. As additional information is gathered and the incident evolves, updated incident information is provided. Incidents include any event that impacts transportation system operation ranging from routine incidents (e.g., disabled vehicle at the side of the road) through large-scale natural or human-caused disasters that involve loss of life, injuries, extensive property damage, and multi-jurisdictional response. This also includes special events, closures, and other planned events that may impact the transportation system.
incident information for public Report of current desensitized incident information prepared for public dissemination.
service patrol dispatch request Service patrol dispatch instructions including incident location and available information concerning the incident.
service patrol dispatch response Request for additional dispatch information and provision of en route status.
service patrol incident status Information gathered at the incident site by a service patrol vehicle that more completely characterizes the incident, the services provided, and clearance status.
traffic operator data Presentation of traffic operations data to the operator including traffic conditions, current operating status of field equipment, maintenance activity status, incident status, video images, security alerts, emergency response plan updates and other information. This data keeps the operator appraised of current road network status, provides feedback to the operator as traffic control actions are implemented, provides transportation security inputs, and supports review of historical data and preparation for future traffic operations activities.
traffic operator input User input from traffic operations personnel including requests for information, configuration changes, commands to adjust current traffic control strategies (e.g., adjust signal timing plans, change DMS messages), and other traffic operations data entry.

Goals and Objectives

Associated Planning Factors and Goals

Planning Factor Goal
A. Support the economic vitality of the metropolitan area, especially by enabling global competitiveness, productivity, and efficiency; Improve freight network
B. Increase the safety of the transportation system for motorized and nonmotorized users; Reduce fatalities and injuries
C. Increase the security of the transportation system for motorized and nonmotorized users; Improve security
D. Increase the accessibility and mobility of people and for freight; Reduce congestion
F. Enhance the integration and connectivity of the transportation system, across and between modes, for people and freight; Enhance integration and connectivity
G. Promote efficient system management and operation; Improve efficiency
I. Improve the resiliency and reliability of the transportation system and reduce or mitigate stormwater impacts of surface transportation; Improve resiliency and reliability

Associated Objective Categories

Objective Category
Arterial Management: Reliability
Emergency/Incident Management: Customer Satisfaction
Emergency/Incident Management: Incident Duration
Emergency/Incident Management: Inter-Agency Coordination
Emergency/Incident Management: Person Hours of Delay
System Efficiency: Cost of Congestion

Associated Objectives and Performance Measures

Objective Performance Measure
Increase customer satisfaction with the region's incident management by X percent over Y years. Percentage of customers satisfied with region's incident management practices.
Increase the number of corridors in the region covered by regional coordinated incident response teams by X percent in Y years. Number of TIM corridors in the region covered by regional coordinated incident response teams.
Reduce buffer index on arterials during peak and off-peak periods by X percent in Y years. The buffer index (represents the extra time (buffer) travelers add to their average travel time when planning trips in order to arrive on-time 95 percent of the time).
Reduce delay associated with incidents on arterials by X percent by year Y. Hours of delay associated with incidents.
Reduce mean incident clearance time per incident by X percent over Y years. (Defined as the time between awareness of an incident and the time the last responder has left the scene.) Mean incident clearance time per incident.
Reduce mean incident notification time (defined as the time between the first agency's awareness of an incident and the time to notify needed response agencies) by X percent over Y years (i.e., through "Motorist Assist" roving patrol programs, reduction of inaccurate verifications, etc.). Average incident notification time of necessary response agencies.
Reduce mean roadway clearance time per incident by X percent over Y years. (Defined as the time between awareness of an incident and restoration of lanes to full operational status.) Mean roadway clearance time per incident.
Reduce mean time for needed responders to arrive on-scene after notification by X percent over Y years. Mean time for needed responders to arrive on-scene after notification.
Reduce mean time of incident duration (from awareness of incident to resumed traffic flow) on transit services and arterial and expressway facilities by X percent in Y years. Mean time of incident duration.
Reduce the annual monetary cost of congestion per capita for the next X years. Cost (in dollars) of congestion or delay per capita.
Reduce the person hours (or vehicle hours) of total delay associated with traffic incidents by X percent over Y years. Person hours (or vehicle hours) of delay associated with traffic incidents.

 
Since the mapping between objectives and service packages is not always straight-forward and often situation-dependent, these mappings should only be used as a starting point. Users should do their own analysis to identify the best service packages for their region.

Needs and Requirements

Need Functional Object Requirement
01 Roadway Service Patrol Operations need to be able to monitor service patrol vehicle locations and dispatch service patrol vehicles to identified incident locations. EV Service Patrol Vehicle Operations 01 The service patrol vehicle shall track its current location.
02 The service patrol vehicle shall send the vehicle's location and operational data to the center for dispatch.
03 The service patrol vehicle shall receive incident details and a suggested route when dispatched to a scene.
TMC Service Patrol Management 01 The center shall dispatch roadway service patrol vehicles to identified incident locations.
02 The center shall store the current status of all service patrol vehicles available for dispatch and those that have been dispatched.
04 The center shall track the location and status of service patrol vehicles.
02 Roadway Service Patrol Operations need to be able to monitor roads and aid motorists, offering rapid response to minor incidents (flat tire, accidents, out of gas) in order to minimize disruption to the traffic stream. EV Service Patrol Vehicle Operations 04 The service patrol vehicle shall send the current en route status (including estimated time of arrival) and requests for emergency dispatch updates.
05 The service patrol vehicle shall provide the personnel on-board with dispatch information, including incident type and location, and forward an acknowledgment from personnel to the center that the vehicle is on its way to the incident scene.
07 The roadway service patrols vehicle shall monitor roads and aid motorists, offering rapid response to minor incidents (flat tire, accidents, out of gas).
03 Roadway Service Patrol Operations need to be able to share incident information collected by the service patrol with traffic, maintenance and construction, and traveler information systems. EV Service Patrol Vehicle Operations 06 The service patrol vehicle shall update the center with status of an incident response including the nature of the incident, e.g. flat tire, gas, minor accident.
TMC Service Patrol Management 03 The center shall share incident information collected by the service patrol with traffic, maintenance and construction, and traveler information centers for incident management, incident notification to travelers, and incident cleanup.

Related Sources

Document Name Version Publication Date
ITS User Services Document 1/1/2005


Security

In order to participate in this service package, each physical object should meet or exceed the following security levels.

Physical Object Security
Physical Object Confidentiality Integrity Availability Security Class
Emergency Management Center High High Moderate Class 4
Emergency Vehicle OBE Moderate Moderate Moderate Class 2
Maint and Constr Management Center High High Moderate Class 4
Traffic Management Center High Moderate Moderate Class 4
Transportation Information Center Low Low Moderate Class 1



In order to participate in this service package, each information flow triple should meet or exceed the following security levels.

Information Flow Security
Source Destination Information Flow Confidentiality Integrity Availability
Basis Basis Basis
Emergency Personnel Emergency Vehicle OBE emergency personnel input Moderate Moderate Moderate
Some of the information, such as incident status information, is sensitive, and should be protected. The system must know that these requests came from actual Emergency Personal. Additionally, incorrect information here may lead to the system responding incorrectly to the incident These messages are important for the system to operate properly. Additionally, the system must know if messages are not received so that it can act accordingly.
Emergency Vehicle OBE Emergency Personnel emergency personnel information presentation Moderate Moderate Moderate
Some of this information, such as incident information, is sensitive and should be protected. This information could affect how the Emergency Personnel respond to the event, and should be as accurate as possible. This information needs to be available for the Emergency Personnel in order for them to respond accurately to the system. If they do not acknowledge this information, dispatch needs to know, so they can attempt to contact the Emergency Personnel via another channel, such as radio.
Emergency Vehicle OBE Traffic Management Center emergency vehicle tracking data Moderate Moderate Moderate
Emergency Vehicles give obvious visual and audio indicators about their location and operating status. Knowing the location of every single emergency vehicle within a city could be extremely useful information to a criminal. Additionally, although this is observable data, it is transmitted on a regional level, which means that someone who is able to intercept it would be able to read the location of all emergency vehicles, not just the ones they could directly observed. A sufficiently motivated criminal can however get this information by other means. Incorrect data here could lead to incorrect decisions being made about the closure of lanes, or incorrect information being shared with the emergency vehicles. There should be other indicators that would contradict incorrect information transmitted here. This information may be used to determine which emergency vehicle is dispatched, and having this information available could lead to a quicker response from the emergency vehicle. However, the system would still be able to operate properly if only most messages make it through.
Emergency Vehicle OBE Traffic Management Center service patrol dispatch response Moderate Moderate Moderate
Suggests routing of the receiving emergency vehicle and severity of the incident, which could be used by an attacker who wished to harm that vehicle or harm something/someone in an area the vehicle vacates. Inaccurate or corrupted information here could lead to an inappropriate response, compromising the purpose of the request. Unavailability of this flow will negatively affect the response to the incident, locally compromising mobility and possibly safety.
Emergency Vehicle OBE Traffic Management Center service patrol incident status Moderate Moderate Moderate
Specifically describes the conditions of an incident, which may include PII-related information, or at least information of a sensitive nature for severe incidents, which should be protected from viewing to protect the privacy of those involved. Inaccurate or corrupted or unavailable information here could lead to an inappropriate incident management action, which while not likely to impact safety-related actions (which would be carried out by Emergency-related actors), but which could impact mobility. Inaccurate or corrupted or unavailable information here could lead to an inappropriate incident management action, which while not likely to impact safety-related actions (which would be carried out by Emergency-related actors), but which could impact mobility.
Traffic Management Center Emergency Management Center incident information High Moderate Moderate
This data contains all of the information regarding the incident. This could include personal information regarding persons involved in the incident. It could also include sensitive information regarding special events or closures. Minor discrepancies in this data should not have a catastrophic effect, but it should be reasonably controlled and accurate. A few missed messages should not have a significant effect. However, most messages should make it through and the TMC should be able to know if the EMC has received a message.
Traffic Management Center Emergency Vehicle OBE service patrol dispatch request Moderate Moderate Moderate
Suggests routing of the receiving emergency vehicle and severity of the incident, which could be used by an attacker who wished to harm that vehicle or harm something/someone in an area the vehicle vacates. Inaccurate or corrupted information here could lead to an inappropriate response, compromising the purpose of the request. Unavailability of this flow will negatively affect the response to the incident, locally compromising mobility and possibly safety.
Traffic Management Center Maint and Constr Management Center incident information High Moderate Moderate
This data contains all of the information regarding the incident. This could include personal information regarding persons involved in the incident. It could also include sensitive information regarding special events or closures. Minor discrepancies in this data should not have a catastrophic effect, but it should be reasonably controlled and accurate. A few missed messages should not have a significant effect. However, most messages should make it through and the TMC should be able to know if the EMC has received a message.
Traffic Management Center Traffic Operations Personnel traffic operator data Moderate Moderate Moderate
Backoffice operations flows should have minimal protection from casual viewing, as otherwise imposters could gain illicit control or information that should not be generally available. Information presented to backoffice system operators must be consistent or the operator may perform actions that are not appropriate to the real situation. The backoffice system operator should have access to system operation. If this interface is down then control is effectively lost, as without feedback from the system the operator has no way of knowing what is the correct action to take.
Traffic Management Center Transportation Information Center incident information for public Low Moderate Moderate
Generally, center-originating flows destined for a TIC don't contain any personal or confidential information, and are eventually intended for some kind of public consumption. Incident information will be used to make routing and other travel decisions. Corrupted information may have a significant impac t on travel plans and/or road network conditions. Significant numbers of travelers serve as end users for the information in this flow; lack of availability has a significant effect on their travel decisions.
Traffic Operations Personnel Traffic Management Center traffic operator input Moderate High High
Backoffice operations flows should have minimal protection from casual viewing, as otherwise imposters could gain illicit control or information that should not be generally available. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system.

Standards

Currently, there are no standards associated with the physical objects in this service package. For standards related to interfaces, see the specific information flow triple pages. These pages can be accessed directly from the SVG diagram(s) located on the Physical tab, by clicking on each information flow line on the diagram.





System Requirements

System Requirement Need
001 The system shall dispatch roadway service patrol vehicles to identified incident locations. 01 Roadway Service Patrol Operations need to be able to monitor service patrol vehicle locations and dispatch service patrol vehicles to identified incident locations.
002 The system shall store the current status of all service patrol vehicles available for dispatch and those that have been dispatched. 01 Roadway Service Patrol Operations need to be able to monitor service patrol vehicle locations and dispatch service patrol vehicles to identified incident locations.
003 The system shall share incident information collected by the service patrol with traffic, maintenance and construction, and traveler information centers for incident management, incident notification to travelers, and incident cleanup. 03 Roadway Service Patrol Operations need to be able to share incident information collected by the service patrol with traffic, maintenance and construction, and traveler information systems.
004 The system shall track the location and status of service patrol vehicles. 01 Roadway Service Patrol Operations need to be able to monitor service patrol vehicle locations and dispatch service patrol vehicles to identified incident locations.
005 The system shall track its current location. 01 Roadway Service Patrol Operations need to be able to monitor service patrol vehicle locations and dispatch service patrol vehicles to identified incident locations.
006 The system shall send the vehicle's location and operational data to the center for dispatch. 01 Roadway Service Patrol Operations need to be able to monitor service patrol vehicle locations and dispatch service patrol vehicles to identified incident locations.
007 The system shall update the center with status of an incident response including the nature of the incident, e.g. flat tire, gas, minor accident. 03 Roadway Service Patrol Operations need to be able to share incident information collected by the service patrol with traffic, maintenance and construction, and traveler information systems.
008 The system shall monitor roads and aid motorists, offering rapid response to minor incidents (flat tire, accidents, out of gas). 02 Roadway Service Patrol Operations need to be able to monitor roads and aid motorists, offering rapid response to minor incidents (flat tire, accidents, out of gas) in order to minimize disruption to the traffic stream.