Control and Sensor Requirements and Issues in AHS

  • Petros Ioannou


The current highway traffic system consists of the following basic elements and decision makers: the driver who controls the motion of the vehicle and makes decisions regarding the path of the vehicle, the route, destination, and so forth; the vehicle that obeys the commands of the driver whose on-board diagnostics often provide information to the driver about the health of the vehicle components; and the roadway or infrastructure that controls the flow of traffic using ramp metering, traffic lights, and roadway signs. These three basic elements interact and may influence each other considerably. For example, an inappropriate action by a driver of a single vehicle could have a dramatic effect on the performance of the overall traffic system. Similarly, a broken or low-performance vehicle could cause a large disturbance in the flow of traffic that may lead to heavy congestion. The roadway commands via road signs, ramp metering, and the like may equally have a negative effect on traffic flow if they are not the appropriate ones for the state of the traffic system the moment they are applied due to inaccurate sensing and/or incorrect control decision making. Inappropriate actions by any one of the three basic elements may not only lead to deterioration of performance and congestion but also to accidents and loss of human life.


Traffic Flow Time Headway Comfortable Ride Lane Change Traffic System 
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Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Petros Ioannou
    • 1
  1. 1.Center for Advanced Transportation TechnologiesUniversity of Southern CaliforniaLos AngelesUSA

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