Free Flow Capacity and Queue Discharge Rate: Long-Term Changes

Knoop, V.L.; Hoogendoorn, S.P.

doi:10.1177/03611981221078845

Free Flow Capacity and Queue Discharge Rate

Title

Free Flow Capacity and Queue Discharge Rate: Long-Term Changes

Author

Knoop, V.L. (TU Delft Transport and Planning)
Hoogendoorn, S.P. (TU Delft Transport and Planning)

Department

Transport and Planning

Date

2022

Abstract

Traffic jams are caused by a traffic demand that exceeds road capacity. Road capacity, therefore, is an important road feature. This capacity might change as function of time, even for the same road stretch, owing to changing driving behaviors or vehicle characteristics. In this study, we empirically analyzed the changes in road capacity over a 5- to 10-year period. The study differentiated between free flow capacity and queue discharge rate. We used three road stretches that remained unchanged to study free flow capacity. For 143 other locations that experienced changing properties over time, we analyzed queue discharge rates and corrected for external changes. We found that free flow capacity decreased, and queue discharge rates (slightly) increased over time. It is remarkable that one decreased, whereas the other increased. These results could be used in policies for road planning and design. Moreover, they provide an interesting background for further studies analyzing the effects of particular behavioral changes or driver assistance systems.

Subject

operations
traffic flow
traffic flow theory and characteristics

To reference this document use:

http://resolver.tudelft.nl/uuid:43a63525-1f8e-4329-b821-f6be50905dce

DOI

https://doi.org/10.1177/03611981221078845

ISSN

0361-1981

Source

Transportation Research Record, 2676 (7), 483-494

Part of collection

Institutional Repository