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Travel Time And Alternate Route On CMS. Chao Chen, Karl Petty PeMS Development Group University of California, Berkeley 10/24/2002. Provide real-time information where it’s most helpful. Travel times Alternate routes Incidents Updated automatically. Benefits.

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slide1

Travel Time And Alternate Route On CMS

Chao Chen, Karl Petty

PeMS Development Group

University of California, Berkeley

10/24/2002

provide real time information where it s most helpful
Provide real-time information where it’s most helpful
  • Travel times
  • Alternate routes
  • Incidents
  • Updated automatically
benefits
Benefits
  • Minimize travel time by picking the best route
  • Reduce uncertainty in travel time
  • Distribute load to less congested corridors
  • Quantify delays
feasibility
Feasibility
  • There are many CMS on CA freeways
  • PeMS already measures and predicts travel times
  • The information is easily made available
  • A similar CMS travel time service exists in Paris and works well

District 12 CMS locations

objective of this study
Objective of this study
  • Quantify benefit of travel time on CMS
  • Choose locations where potential benefits are greatest
    • Alternate routes are available
    • Lots of congestion
slide8

Travel time variability

  • Travel times for 20 days in October, 2000, on I-10E, between pm 1.3 and 48.5, starting every 5-min, between 5 am and 8 pm
  • Shows large variation between 42 and 130 minutes
  • Permits prediction of travel time
travel times on two routes in san diego
Congestion occurs on both routes

Travel time varies between 15 and 45 minutes

Travel times on two routes in San Diego
  • Average travel times are similar – these are equally good alternatives
prediction minimizes travel time
Prediction minimizes travel time
  • Each dot represents one trip
  • Prediction almost always picks the best route
  • Even when prediction doesn’t pick the best route, the travel difference is small
prediction reduces uncertainty
Prediction reduces uncertainty
  • Prediction is accurate to 2 minutes on 23 minute trip
  • More than 50% reduction in uncertainty in peak hours
list of study areas
List of study areas
  • District 7 – Los Angeles and Ventura Counties, from I-10 and I-210 to downtown
  • District 11 – San Diego, from I-5 and I-805 to downtown (I-5 and I-163)
  • District 11 – from SR-125 and I-8 to downtown
  • District 12 – Orange County, from I-5 and I-405 to I-5 and SR-91
  • District 12 – from I-5 and I-405 to I-405 and I-605
still to do
Still to do
  • Do same study for more O-D locations
  • Decide how to interface PeMS and Caltrans CMS system
  • Make sure PeMS travel times are accurate
conclusion
Conclusion
  • Travel time prediction on CMS can reduce travel time when alternate routes exist
  • It greatly improves travel time predictability