Office of the Assistant Secretary for Research and Technology
ITS Joint Program Office

Connected Vehicle Applications Supported by ITS Standards

The following applications are currently supported by the following standards (either in ballot or soon to be in ballot). Note that protocol stack standards (IEEE 802.11 and 1609.x are not included in this list).

Title Short Description & Goal Standard

PR1: Localized Public Transport Signal Priority (TSP)

This use case describes the basic priority control for connected Public Transport vehicles. The goal is to improved Public Transport efficiency and reliability.

ISO 19091

PR1-a: Localized Transit Signal Priority – Near Side Stop

This use case describes the basic priority control for connected Public Transport vehicles for near side stops. The goal is to improved Public Transport efficiency and reliability.

ISO 19091

PR2: Public Transport Signal Priority along an arterial (group of intersections)

This use case describes the basic priority control for a connected Public Transport vehicle travelling through a section of signalized intersections. The goal is to improved Public Transport efficiency and reliability.

ISO 19091

PR3: Localized Freight Signal Priority

This use case describes the basic priority control for connected heavy vehicle. The goal is to improve freight movement efficiency and reliability.

ISO 19091

PR3-a: Localized Freight Signal Priority with a Platoon

This use case describes the basic priority control for connected a heavy vehicle platoon.  The goal is to improve freight movement efficiency and reliability.

ISO 19091

PR3-b: Arterial Freight Signal Priority for a Platoon

This use case describes the basic priority control for a connected freight platoon travelling through a section of signalized intersections. The goal is to improve freight movement efficiency and reliability.

ISO 19091

PR4: Emergency Vehicle Single or Multiple Vehicles (normal power PSOBE)

This use case describes the basic emergency vehicle preemption control for connected emergency response vehicles (Police, fire, ambulance, etc.). The nature of those vehicles permitted to make such requests will depend on the region and local laws. Note that this use case does not deal with the vehicle based applications that warn the driver to take appropriate action to avoid the approaching (rear, front, side) emergency vehicle. The goal is to improve emergency response efficiency and reliability.

ISO 19091

PR5: Emergency Vehicle Single or Multiple Vehicles (high power PSOBE)

This use case differs from the previous use case because it is based on the concept of a one-way broadcast to the intersection – such that the intersection is likely to "hear” the SRM before the vehicle (OBE) can hear the intersection SPaT message. It is anticipated that if the high power PSOBE is supported for such vehicles (Police, fire, ambulance, etc.) the intersection can receive advance warning of the approaching vehicle and take the appropriate steps to facilitate movement through the intersection based on a specific scenario(s). The nature of those vehicles permitted to make such requests will depend on the region and local laws. Note that this use case does not deal with the vehicle based applications that warn the driver to take appropriate action to avoid the approaching (rear, front, side) emergency vehicle. The goal is to improve emergency response efficiency and reliability.

ISO 19091

PR6: Mixed Emergency Vehicle and Other Priority Eligible Vehicles

This use case describes multiple priority requesting vehicles including an emergency vehicle and a platoon of public transport vehicles. The nature of those vehicles permitted to make such requests will depend on the region and local laws. The goal is Improved priority granting efficiency and reliability.

ISO 19091

SA1: Dilemma Zone Protection

This use case describes detection of equipped vehicles approaching a traffic signal that, upon onset of yellow, may find it challenging to either stop before the stop bar or continue through the intersection before the signal turns red. Vehicles in this situation are termed dilemma zone vehicles though their actual location may vary. The goal is to Detect potential dilemma zone vehicles and pass information to signal controller to minimize occurrences.

ISO 19091

SA2: Red Light Violation Warning

This use case describes provision of signal timing information to approaching vehicles to help prevent red light violations. Roadside equipment sends MAP and SPaT in real-time to approaching vehicles, which utilize the information to notify driver of need to stop to avoid potential red light violation.

ISO 19091

SA3: Stop Sign Violation Warning

This use case describes provision of stop sign location information to approaching vehicles to help prevent stop sign violations (running). Roadside equipment sends MAP and SPaT to vehicles, which utilize the information to notify driver of need to stop to avoid running stop sign.

ISO 19091

SA4: Turning Assistant – Oncoming Traffic

This use case describes the provision of information on approaching oncoming traffic to vehicle(s) waiting to turn at a signalized intersection. Roadside equipment sends MAP, SPaT, and Sensor information to a vehicle waiting to turn across oncoming traffic to warn its driver of potential conflicts.

ISO 19091

SA5: Turning Assistant - Vulnerable Road User Avoidance

This use case describes provision of information on vulnerable road users (e.g., cyclists, pedestrians) to turning traffic at a signalized intersection. Roadside equipment sends MAP, SPaT, and Sensor information to a vehicle about to turn to warn its driver of potential conflicts with vulnerable road users.

ISO 19091

SA6: Non-signalized Crossing Traffic Warning

This use case describes provision of information on cross traffic at a non-signalized intersection. Roadside equipment sends MAP and sensor information (position, movement from OBE-equipped vehicles or roadside sensors) to vehicle. The information provided includes trajectory of crossing traffic to prevent potential crossing path crashes.

ISO 19091

SA7: Crossing Vulnerable Road User Advisory (Non-signalized)

This use case describes provision of information on vulnerable road users (e.g. cyclists, pedestrians) to traffic at a non-signalized intersection. Roadside equipment sends MAP, SPaT, and Sensor information to a vehicle that is approaching a pedestrian/vulnerable road user crossing, at a non-signalized intersection, in order to warn the driver of potential conflicts with pedestrian/vulnerable road users.

ISO 19091

MS1: Basic Local Traffic Signal Actuation

This use case describes basic real-time traffic signal actuation by connected vehicles in the vicinity of a single intersection. Roadside equipment utilizes real-time information on the motion and specific characteristics of approaching vehicles to provide more precise demand information to the local traffic signal controller, thereby increasing efficiency and reducing emissions for the intersection.

ISO 19091

MS2: Platoon Detection for Coordinated Signals

This use case describes provision of vehicle platoon characteristics to facilitate real-time arterial-level traffic signal timing adjustments. This case only targets timing optimization (i.e. does not send directions to drivers). Roadside equipment relays vehicle platoon information to BOPC which uses information to dynamically adjust signal timing offsets.

ISO 19091

MS3: Congested Intersection Adjustment

This use case describes detection of persistent traffic signal phase failures on one or more maneuvers and executing mitigating adjustments to traffic signal plans at the intersection(s). Multi-intersection adjustments involve a BOPC. Reduce impacts of phase failures at a congested intersection by utilizing adjustments to traffic signal timing based on mitigation strategies.

ISO 19091

MS4: Traffic Signal Optimal Speed Advisory

This use case describes provision of traffic signal information to approaching vehicles to enable speed adjustment, and lane switching, to optimize vehicle trajectory for smooth operation of the vehicle. Roadside equipment sends MAP and SPaT in real-time to approaching vehicles, which utilize the information to notify driver of optimal speed to smoothly stop or traverse the intersection.

ISO 19091

MS5: Signalized Corridor Eco-Driving Speed Guidance

This use case describes the provision of traffic signal information to approaching vehicles to enable speed and lane adjustments to optimize vehicle trajectory for improved fuel efficiency in a corridor.
Roadside equipment sends MAP and SPaT in real-time to approaching vehicles, which utilize the information to notify vehicle of optimal speed and lane use to smoothly stop or traverse the intersection using less fuel

ISO 19091

MS6: Idling Stop Support

This use case describes provision of traffic signal timing information to vehicles stopped at a signal to enable engine shutoff.
Roadside equipment sends MAP and SPaT in real-time to vehicles stopped at the intersection to enable drivers/vehicles to turn off engines while idling (stopped).

ISO 19091

MS7: Start Delay Prevention

This use case describes provision of traffic signal timing information to vehicles stopped at a signal to enable efficient resumption of flow. Roadside equipment sends MAP and SPaT in real-time to vehicles stopped at the intersection to enable drivers/vehicles to prepare for startup efficiently.

ISO 19091

MS9: Inductive Charging at Signals

This use case describes provision of inductive charging information to vehicle stopped at a signal. Actual charging transaction and technology is outside scope. Roadside equipment sends MAP and SPaT in real-time to vehicles stopped at the intersection to enables vehicles to establish temporary charging.

ISO 19091

MS10: Don’t Block the Box

This use case describes OBE vehicles determining whether they can enter and clear an intersection or stopping until they can enter and clear. Roadside equipment sends MAP and SPaT in real-time to vehicles approaching the intersection to enable vehicles to determine whether to enter the intersection or to wait.

ISO 19091

Emergency Electronic Brake Lights (EEBL)

The EEBL safety application warns the driver of the HV in the case of a hard-braking event by an RV that is ahead and in the same lane or an adjacent lane. Upon receiving such event information, the HV determines the relevance of the event and provides a warning to the driver, if appropriate.

J2945/1

Forward Crash Warning (FCW)

The FCW safety application warns the driver of the HV in the case of an impending rear-end crash with an RV directly ahead in the same lane and direction of travel. The FCW is intended to help drivers avoid or mitigate rear-end vehicle crashes in the forward path of travel.

J2945/1

Blind Spot Warning/Lane Change Warning (BSW/LCW)

The BSW/LCW safety application warns the driver of the HV during a lane change attempt if the blind-spot zone into which the HV intends to move into is, or will soon be, occupied by another vehicle traveling in the same direction. Moreover, the application may also provide advisory information that is intended to inform the driver of the HV that a vehicle in an adjacent lane is positioned in a blind-spot zone of the HV when a lane change is not being attempted.

J2945/1

Intersection Movement Assist (IMA)

The IMA safety application warns the driver of an HV when it is not safe to enter an intersection due to a crash possibility with RVs.

J2945/1

Left Turn Assist (LTA)

The LTA safety application warns the driver of an HV that, due to oncoming traffic, it may not be safe to proceed when attempting a left turn.

J2945/1

Control Loss Warning (CLW)

The CLW safety application warns the driver of the HV in the case of an emergency control loss event (defined as activation of the Antilock Brake System, Traction Control System, or Stability Control System) by an RV traveling in the same or opposite direction. The RV broadcasts control loss event information within the BSM. Upon receiving such event information, the HV determines the relevance of the event and provides a warning to the driver of the HV.

J2945/1

Emergency Vehicle Alert (EVA)

Alerts the driver about the location of and the movement of public safety vehicles responding to an incident so the driver does not interfere with the emergency response.  Note that other related use cases outside of the current scope make use of the infrastructure to allow authorized Public Safety Vehicle to traverse a signalized intersection. Help drivers to avoid collisions with nearby emergency vehicles and to clear the roadway so that emergency vehicles can proceed more effectively.

J2945/2

Roadside Alert (RSA)

This use case is used by non-standard vehicles to communicate stopped or slow-moving behaviors which may obstruct or complicate mainstream traffic to other drivers and vehicles.  This may require drivers to be alert or take action to provide additional clearance to roadside activities. Help drivers to avoid collisions with nearby non-standard vehicles such as school buses and others that may disturb the free flow of traffic as part of their routine operations; and to provide additional clearance for roadside activities.

J2945/2

Situational Awareness - Weather Conditions

This use case describes a vehicle broadcasting potential inclement weather, as determined by the vehicle's sensors. Provide warnings to alert road users about inclement weather conditions that might call for a reduction of speed or other action.

J2945/2

Situational Awareness – Obstacle (SAW – O)

This use case describes a vehicle broadcasting the presence of a potential obstacle in the roadway. Provide warnings to alert road users to a potential obstacle in the roadway.

J2945/2

Situational Awareness – Suboptimal Road Segment Conditions

This use case describes a vehicle broadcasting potentially suboptimal road conditions. Provide warnings to alert road users to a potential suboptimal road condition.

J2945/2