Collaborative controlling method of variable speed limit and ramp metering for expressways based on crash risk
US11468771B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2021 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Sep 8, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to a variable speed limit (VSL), ramp metering (RM), and a collaborative method of variable speed limit and ramp metering (VSL-RM) on expressways based on crash risk, including the following steps: 1) calculating the crash risk index within each control step, activating the VSL-RM strategy when the crash risk index exceeds the threshold of the crash risk index, and 2) conduct a multiple-ramp metering strategy, determine the ramps to be controlled and the start-up time for RM, and calculate the integrated ramp regulation rate; 3) execute a variable speed limit strategy to obtain the displayed speed limit value for the segment downstream of the cluster and adjust the ramp regulation rate, mainline desired speed and mainline speed of the segment for the next time period accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.