| Title | Signal timing under saturated conditions. |
|---|---|
| Record ID | 38821 |
| Personal Name Creator |
Denney, Richard W.; Head, Larry; Spencer, Kevin |
| Corporate Creator | Booz Allen Hamilton |
| Corporate Contributor |
United States. Federal Highway Administration |
| Publisher | United States. Federal Highway Administration |
| Publication Date | 20081100 |
| Language | English |
| Abstract | This report provides guidance to practitioners on effective strategies to mitigate the effects of congestion at signalized intersections. The scope is limited to single intersections and does not address network-level strategies. The strategies are defined in terms of their underlying objective. Under congested conditions, traditional objectives and performance measures shift from progression and minimizing delay to maximizing throughput and managing queues. Experts were interviewed to identify the strategies and tactics they used to address congested intersections, a discussion of their methods is presented. Select strategies were studied further, particularly the belief that longer cycles are more efficient, and the effects of buses on signal timing in grid networks. The research revealed that long cycle lengths may not be more efficient at intersections where long queues starve turn lanes. In grid networks, the cycle length that is just long enough to reliably serve busses from a near-side stop was found through simulation to prevent the development of residual queues. |
| Rosap ID | dot:20668 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/20668 |
| TRT Terms | Signalized intersections; Traffic signal timing; Traffic congestion; Saturation flow |
| General Subjects | Signalized intersections, Traffic signal timing, Congestion, Cycle lengths, Throughput, Queue management |
| Geographical Coverage |
United States |
| Contract Number | DTFH61-06-D-00006 |
| Report Number | FHWA-HOP-09-008 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/38000/38800/38821/fhwahop09008.pdf |
| Format | |
| Database | NTL Digital Repository |