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6.1 Longitudinal Collision Avoidance (User Service*)

The Longitudinal Collision Avoidance user service is specifically aimed at providing vehicle operators with assistance in avoiding longitudinal collisions to the front and/or rear of the vehicle. The service provides rear-end collision warning and control, Adaptive Cruise Control (ACC), head-on collision warning and control, and backing collision warning. Longitudinal collision avoidance systems assist the driver by: (1) sensing potential and/or impending collisions or dangers to the front or rear of the vehicle; (2) eliciting proper collision avoidance actions from the driver; and/or (3) providing temporary automatic control of the vehicle to assist the driver in avoiding the potential collision situation.

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User Service Requirements*:

6.1.0	ITS shall include a Longitudinal Collision Avoidance Service.
	PSpecs*: 3.1.1 , 3.1.3 , 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2 , 3.2.3.4.5
6.1.1	Longitudinal Collision Avoidance Service shall include a Rear-End Subservice.
	PSpecs*: 3.1.1 , 3.1.3 , 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2 , 3.2.3.4.5
6.1.1.1	Rear-End Subservice shall include a Headway Maintenance System which assists in maintaining a safe relative longitudinal separation between vehicles.
	PSpecs*: 3.1.3 , 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2 , 3.2.3.4.5
6.1.1.1.1	Headway Maintenance System shall include a Manual Operations Subsystem.
	PSpecs*: 3.1.3 , 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2 , 3.2.3.4.5
6.1.1.1.1.1	Manual Operations Subsystem shall determine impending situations that are inconsistent with safe headway.
	PSpecs*: 3.1.3
6.1.1.1.1.2	Manual Operations Subsystem shall alert the vehicle's driver of the need for speed control to maintain a safe headway.
	PSpecs*: 3.1.3
6.1.1.1.2	Headway Maintenance System shall include an Autonomous Intelligence Cruise Control (AICC) Subsystem.
	PSpecs*: 3.1.3 , 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2 , 3.2.3.4.5
6.1.1.1.2.1	Autonomous Intelligence Cruise Control Subsystem shall determine actions necessary to maintain the vehicle at a safe distance behind a lead vehicle.
	PSpecs*: 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2
6.1.1.1.2.2	Autonomous Intelligence Cruise Control Subsystem shall implement necessary vehicle speed control.
	PSpecs*: 3.2.3.2 , 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2
6.1.1.1.3	Headway Maintenance System shall include a Cooperative Intelligence Cruise Control (CICC) Subsystem.
	PSpecs*: 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2
6.1.1.1.3.1	Cooperative Intelligence Cruise Control Subsystem shall be capable of operating the vehicle in a follow-lead-vehicle mode or a "platoon" mode.
	PSpecs*: 3.2.3.3 , 3.2.3.4.1 , 3.2.3.4.2
6.1.1.2	Rear-End Subservice shall include a Driver Action System
	PSpecs*: 3.1.1 , 3.1.3
6.1.1.2.1	Driver Action System shall inform the driver of the need for immediate collision avoidance action.
	PSpecs*: 3.1.1 , 3.1.3
6.1.1.3	Rear-End Subservice shall include an Automatic Control System.
	PSpecs*: 3.1.3 , 3.2.3.3
6.1.1.3.1	Automatic Control System shall automatically implement needed collision avoidance action.
	PSpecs*: 3.1.3 , 3.2.3.3
6.1.2	Longitudinal Collision Avoidance Service shall include a Backing Subservice.
	PSpecs*: 3.1.1 , 3.1.3 , 3.2.3.3
6.1.2.1	Backing Subservice shall include an Advisory System.
	PSpecs*: 3.1.1 , 3.1.3
6.1.2.1.1	Advisory System shall notify the driver of the presence of potentially hazardous situations.
	PSpecs*: 3.1.1 , 3.1.3
6.1.2.2	Backing Subservice shall include a Driver Action System
	PSpecs*: 3.1.1 , 3.1.3
6.1.2.2.1	Driver Action System shall inform the driver of the need for immediate collision avoidance action.
	PSpecs*: 3.1.1 , 3.1.3
6.1.2.3	Backing Subservice shall include an Automatic Control System.
	PSpecs*: 3.1.3 , 3.2.3.3
6.1.2.3.1	Automatic Control System shall automatically implement needed collision avoidance action.
	PSpecs*: 3.1.3 , 3.2.3.3
6.1.3	Longitudinal Collision Avoidance Service shall include a Head-On/Passing Subservice.
	PSpecs*: 3.1.1 , 3.2.3.3
6.1.3.1	Head-On/Passing Subservice shall include an Advisory System.
	PSpecs*: 3.1.1
6.1.3.1.1	Advisory System shall notify the driver of the presence of potentially hazardous situations.
	PSpecs*: 3.1.1
6.1.3.2	Head-On /Passing Subservice shall include a Driver Action System.
	PSpecs*: 3.1.1
6.1.3.2.1	Driver Action System shall inform the driver of the need for immediate collision avoidance action.
	PSpecs*: 3.1.1
6.1.3.3	Head-On/Passing Subservice shall include an Automatic Control System.
	PSpecs*: 3.1.1 , 3.2.3.3
6.1.3.3.1	Automatic Control System shall automatically implement needed collision avoidance action.
	PSpecs*: 3.1.1 , 3.2.3.3