Advanced

Dynamic speed adaptation based on information technology - a theoretical background

Varhelyi, Andras LU (1997) In Bulletin / University of Lund, Lund Institute of Technology, Department of Traffic Planning and Engineering 142.
Abstract
Knowledge on the factors influencing driver speed-behaviour, the relationship between speed and traffic safety and means to influence speed behaviour is systematised. Expert judgements and the high proportion of injury accidents show that improved speed adaptation has the largest safety potential in the following situations: - Road surface-, visibility and weather affected situations (e.g. slippery road, fog, darkness). - Places where sudden speed reduction is needed (e.g. motorway exits, sharp bends). - Encounters with crossing-course both between motor vehicles and between motor vehicles and pedestrians/bicyclists (e.g. at intersections, at zebra crossings).



A study on driver speed behaviour in encounters with... (More)
Knowledge on the factors influencing driver speed-behaviour, the relationship between speed and traffic safety and means to influence speed behaviour is systematised. Expert judgements and the high proportion of injury accidents show that improved speed adaptation has the largest safety potential in the following situations: - Road surface-, visibility and weather affected situations (e.g. slippery road, fog, darkness). - Places where sudden speed reduction is needed (e.g. motorway exits, sharp bends). - Encounters with crossing-course both between motor vehicles and between motor vehicles and pedestrians/bicyclists (e.g. at intersections, at zebra crossings).



A study on driver speed behaviour in encounters with pedestrians at a zebra crossing shows that in such situations there is a need for better speed adaptation. In an encounter with a pedestrian, the driver has to be influenced before he reaches the "decision zone" at 50 to 40 m before the zebra crossing, in order to prevent the "signalling by speed" behaviour.



A nationwide survey among 1000 holders of Swedish driving licences shows that the majority of the respondents are positive to a device which automatically lowers the maximum possible speed of the car in slippery conditions and poor visibility, as well as to a device which warns the driver or reduces the speed automatically if the car is about to collide with another road-user. A general system which prevents exceeding the prevailing speed limit is accepted by one third.



A system, which limits the maximal speed of the vehicle in the actual situation via an in-vehicle equipment is proposed. A system algorithm to calculate the appropriate highest speed in different conditions is presented.



The estimated safety effect of the proposed system, if all cars are equipped, is a 20% - 40% reduction of injury accidents reported to the police. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Dr Biehl, Bernhard, Universität Mannheim
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Teknik, Technological sciences, driver acceptance, appropriate speeds, speed behaviour, critical conditions, Social sciences, Samhällsvetenskaper
in
Bulletin / University of Lund, Lund Institute of Technology, Department of Traffic Planning and Engineering
volume
142
pages
220 pages
publisher
Lund University Faculty of Engineering, Technology and Society, Transport and Roads, Lund, Sweden
defense location
Aud.V:C John Ericssons väg 1, Lund
defense date
1997-02-14 10:15
external identifiers
  • other:LUTVDG/(TVTT-1014) 1-220/1996
ISSN
0346-6256
language
English
LU publication?
yes
id
ee752982-f12d-4d82-80b2-72ce796f4490 (old id 18149)
date added to LUP
2007-05-24 10:39:48
date last changed
2016-09-19 08:44:59
@phdthesis{ee752982-f12d-4d82-80b2-72ce796f4490,
  abstract     = {Knowledge on the factors influencing driver speed-behaviour, the relationship between speed and traffic safety and means to influence speed behaviour is systematised. Expert judgements and the high proportion of injury accidents show that improved speed adaptation has the largest safety potential in the following situations: - Road surface-, visibility and weather affected situations (e.g. slippery road, fog, darkness). - Places where sudden speed reduction is needed (e.g. motorway exits, sharp bends). - Encounters with crossing-course both between motor vehicles and between motor vehicles and pedestrians/bicyclists (e.g. at intersections, at zebra crossings).<br/><br>
<br/><br>
A study on driver speed behaviour in encounters with pedestrians at a zebra crossing shows that in such situations there is a need for better speed adaptation. In an encounter with a pedestrian, the driver has to be influenced before he reaches the "decision zone" at 50 to 40 m before the zebra crossing, in order to prevent the "signalling by speed" behaviour.<br/><br>
<br/><br>
A nationwide survey among 1000 holders of Swedish driving licences shows that the majority of the respondents are positive to a device which automatically lowers the maximum possible speed of the car in slippery conditions and poor visibility, as well as to a device which warns the driver or reduces the speed automatically if the car is about to collide with another road-user. A general system which prevents exceeding the prevailing speed limit is accepted by one third.<br/><br>
<br/><br>
A system, which limits the maximal speed of the vehicle in the actual situation via an in-vehicle equipment is proposed. A system algorithm to calculate the appropriate highest speed in different conditions is presented.<br/><br>
<br/><br>
The estimated safety effect of the proposed system, if all cars are equipped, is a 20% - 40% reduction of injury accidents reported to the police.},
  author       = {Varhelyi, Andras},
  issn         = {0346-6256},
  keyword      = {Teknik,Technological sciences,driver acceptance,appropriate speeds,speed behaviour,critical conditions,Social sciences,Samhällsvetenskaper},
  language     = {eng},
  pages        = {220},
  publisher    = {Lund University Faculty of Engineering, Technology and Society, Transport and Roads, Lund, Sweden},
  school       = {Lund University},
  series       = {Bulletin / University of Lund, Lund Institute of Technology, Department of Traffic Planning and Engineering},
  title        = {Dynamic speed adaptation based on information technology - a theoretical background},
  volume       = {142},
  year         = {1997},
}