Validation of Arterial Travel-Time Estimation Models Using Field Data and Simulation; Final rept. for Aug 05-06 Dec

摘要

Use of travel-time models is also another method to estimate arterial transportation system performance. The NIATT research tested two travel-time models-the Overflow Delay Model (ODM) and the Highway Capacity Manual (HCM) travel time models, to observe their performance, to find any limitations they might have, and to determine if their performance could be improved by measuring additional input variables. Field data were collected for individual intersections under a limited range of traffic conditions. Relying on individual intersection performance delay is valid for evaluating travel time estimation models because the delay encountered at intersections accounts for the largest portion of arterial travel time variability. Therefore if a travel time estimation model predicts intersection approach delays well, it will likely do well for estimating arterial wide travel times. Results of this research demonstrate the ODM and HCM models tend to predict accurate delays and travel times for below capacity conditions. However, the ODM and HCM models perform poorly for field data when the worst performing arrival type is assumed. Future research recommendations are included.