signal_phase_indication_from_center_to_vehicles

This data flow is from a transportation information center to a vehicle and contains the actual state of operation of the roadside and grade crossing indicators used to pass instructions to drivers and travelers on roads (surface streets). It is used to provide phase (red, amber, green, left-turn, etc.) information and consists of the following data items each of which is defined in its own DDE:

list_size
+ list_size{indicator_identity
+ roadside_signal_phase_indication}

Sub Data Flows

• indicator_identity
• list_size
• roadside_signal_phase_indication

Parent Data Flows

• None

Associated PSpecs/Terminators

• 2.1.4 - Provide Commercial Vehicle Driver Routing Interface
• 3.1.1 - Produce Collision and Crash Avoidance Data
• 4.1.2 - Determine Transit Vehicle Service Status
• 5.3.3 - Provide Emergency Vehicle Location
• 6.5.9 - Provide Traveler Alert Interface

Parent Information Flows

• intersection status