AVSS08-Advanced Vehicle Longitudinal Control (Service Package*)

Description

This service package automates the speed and headway control functions on board the vehicle. It utilizes safety sensors and collision sensors combined with vehicle dynamics processing to control the throttle and brakes. It requires on-board sensors to measure longitudinal gaps and a processor for controlling the vehicle speed.

Service Package Graphic

Vehicle Longitudinal ControlVehicle Location DeterminationBasic VehicleDriverLocation Data SourceMap Update ProviderVehiclePotential ObstaclesRoadway Environmentdriver updatesbasic vehicle measuresdriver inputsposition fixmap updatesmap update requestphysical presenceroadway characteristicsvehicle control

Get the Source Graphic, a Windows Metafile (WMF), in ZIP format.
About this Graphic

Includes Equipment Packages and Subsystems:

Includes Architecture Flows:

Source Architecture Flow Destination In Graphic
Basic Vehicle basic vehicle measures Vehicle Yes
Driver driver inputs Vehicle Yes
Location Data Source position fix Vehicle Yes
Map Update Provider map updates Vehicle Yes
Potential Obstacles physical presence Vehicle Yes
Roadway Environment roadway characteristics Vehicle Yes
Vehicle vehicle control Basic Vehicle Yes
Vehicle driver updates Driver Yes
Vehicle map update request Map Update Provider Yes
    - This icon indicates that the associated architecture flow either has been or will be addressed by ITS Standards. Select the architecture flow for more information on relevant standards activities.

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; Support regional economic productivity and development
B. Increase the safety of the transportation system for motorized and nonmotorized users; Improve the safety of the transportation system
G. Promote efficient system management and operation; Increase operational efficiency and reliability of the transportation system

Associated Objective Categories

Objective Category
Safety: Vehicle Crashes and Fatalities
System Efficiency: Cost of Congestion
System Efficiency: Duration of Congestion
System Efficiency: Extent of Congestion

Associated Objectives and Performance Measures

Objective Performance Measure
Maintain the rate of growth in facility miles experiencing recurring congestion as less than the population growth rate (or employment growth rate). Percent of lane-miles (or rail) operating at LOS F or V/C > 1.0
Reduce crashes at intersections Number of crashes and fatalities at signalized intersections
Reduce crashes at intersections Number of crashes and fatalities at unsignalized intersections
Reduce crashes at intersections Number of crashes and fatalities related to red-light running
Reduce crashes due to driver errors and limitations Number of crashes and fatalities related to driver inattention and distraction
Reduce crashes due to driver errors and limitations Number of crashes and fatalities related to driving while intoxicated
Reduce crashes due to road weather conditions Number of crashes and fatalities related to weather conditions
Reduce crashes due to unexpected congestion Number of crashes and fatalities related to unexpected congestion
Reduce crashes due to unsafe drivers, vehicles and cargo on the transportation system Number of crashes and fatalities due to commercial vehicle safety violations
Reduce secondary crashes Number of secondary crashes
Reduce speed differential Number of crashes and fatalities related to excessive speeding
Reduce speed differential Number of speed violations
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 daily hours of recurring congestion on major freeways from X to Y by year Z. Hours per day at LOS F or V/C > 1.0 (or other threshold).
Reduce the number of hours per day that the top 20 most congested roadways experience recurring congestion by X percent by year Y. Hours per day at LOS F or V/C > 1.0 (or other threshold).
Reduce the percentage of facility miles (highway, arterial, rail, etc.) experiencing recurring congestion during the peak period by X percent by year Y. Percent of lane-miles (or rail) operating at LOS F or V/C > 1.0
Reduce the share of major intersections operating at LOS Z by X percent by year Y. Percent of intersections operating at LOS F or V/C > 1.0
Reduce the total number of crashes in the region by X percent by year Y. Total crashes per X VMT.
Reduce the total number of crashes involving bicyclists and pedestrians in the region by X percent by year Y. Total crashes involving bicycles.
Reduce the total number of crashes involving bicyclists and pedestrians in the region by X percent by year Y. Total crashes involving pedestrians.
Reduce the total number of fatalities and severe injuries in the region by X percent by year Y. Total fatalities per X VMT.
Reduce the total number of fatalities and severe injuries in the region by X percent by year Y. Total severe injuries per X VMT.

 
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.

Related ITS Applications of ITS Taxonomy

Classification Category ITS Application Area ITS Application(s)
Intelligent Vehicles Driver Assistance Adaptive Cruise Control

User Services related to this Service Package:

User Service
6.1 Longitudinal Collision Avoidance

Transaction Set Diagram





The source graphic, a Windows Metafile (WMF), for the TSD can be downloaded here: TSD

The following discusses how the National ITS Architecture provides the transportation service described by this service package. Each numbered item describes the operation of that portion of the service package identified with the corresponding number on the transaction set diagram.

  1. The driver can activate the system and provide steering and other vehicle control inputs to the vehicle (driver inputs).

  2. Accurate positioning of the vehicle on the road network can also be used to improve performance of the vehicle safety system. Accurate position combined with detailed map data provides information about the road geometry ahead of the vehicle which can be used to adjust alarm thresholds and reduce false alarms. A position fix provides vehicle location and current accurate map data is provided to the vehicle (map update request and map updates).

  3. Vehicle performance and the driver's current control of the vehicle are monitored including basic vehicle measures such as vehicle speed, acceleration, anti-lock brake status, traction control status, acceleration, and turning movement. Sensors detect objects that may be in front of or behind the vehicle (physical presence) as well as the Roadway Environment (roadway characteristics). The Vehicle subsystem analyzes this data and presents updates and alarms to the Driver regarding potential collision with objects, people or vehicles ahead of or behind the vehicle. If a collision or a safety violation is imminent, the vehicle may take evasive action (e.g. change in throttle position, change in transmission gearing, braking - vehicle control).

  4. Driver updates provide information about the operational status of the safety system and a positive indication of any hazardous conditions and automated system activations.