Estimating Traffic Delay at Intersections

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Estimating Traffic Delay at Intersections

• TRAN-2 Team
• Judd Chang
• Grayson Cox
• Andrea Debee

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• Estimating traffic delay due to controlled
  intersections is a vital part of transportation
  planning and many other aspects of city life.
  Knowing traffic delay can help with optimizing
  cycle time for traffic lights, planning emergency
  vehicle routes, and determining the level of
  service (LOS) of the intersection.
• A program used to estimate traffic delays at
  controlled intersections would utilize Websters
  equation
• d 0.38C(1-g/C)2/1-(g/C)(X) 173X2(X-1)
  (X-1)2 (16X/C)1/2
• which has multiple user inputted variables such
  as cycle length of the traffic signal (C),
  effective green light time for the lane (g),
  capacity for the lane (c), etc. The result, d,
  is the average delay time of each individual
  vehicle in a particular lane or lane group.

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• Our program would identify each lane group (e.g.
  left turn lane, north/south-bound lanes,
  east/west-bound lanes, etc.) and display the
  appropriate delay time in a visual layout of the
  intersection similar to the diagram below.

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Resources

• These are some resources we have used thus far
• N.J. Garber L.A. Hoels Traffic Highway
  Engineering (Third Edition, 2002, Brooks/Cole)
• http//www.webs1.uidaho.edu/niatt_labmanual/Chapte
  rs/signaltimingdesign/Introduction/index.htm
• Hedayat Z. Aashtianis Use of Intersection Delay
  Functions to Improve Reliability of Traffic
  Assignment Model (Sharif University of
  Technology)