Fuel consumption at isolated traffic signals

Traditionally the phase split and cycle length of traffic signals at isolated intersections have been set so as to minimise the total delay experienced by the vehicles passing through the intersection. This often means that a moving traffic stream is interrupted to allow waiting vehicles in an opposing stream to proceed. The effect of stopping a vehicle which is travelling at 60 km/h is shown to be the equivalent of delaying a stationary vehicle by approximately an extra 67 seconds. This paper analyses the effect on fuel consumption of varying the cycle length of traffic signals at two isolated intersections for various traffic conditions using a model. It shows that some savings may be obtained in light traffic conditions, while there may be little advantage in modifying cycle length in medium to heavy conditions. The costs of the increased delays that are imposed on motorists when the cycle length is increased are related to the reduced fuel consumption and vehicle operating costs that are achieved under these conditions. The largest potential community benefit appears to be when traffic conditions are relatively light, particularly where the flows on the minor streets are small (a). This paper is no 80021.


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Media Info

  • Pagination: 14P

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Filing Info

  • Accession Number: 01438281
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 24 2012 9:27PM