Abstract
The calculation result of link performance by BPR function is not in consist with practice, it is because BPR does not take into account the fact that traffic quantity increases to link capacity and decrease when traffic condition changed from free to congest. So in this paper some changes were done to BPR function in order to fit practice link condition. One way was adding traffic decrease quantity to link capacity for BPR function when congest happened, which could make link performance reflect practice link condition. The other way was replacing traffic quantity in BPR function with traffic density by equation, and it did some changes to the new function according to the idea got from previous way, then got a function which monotony increase by degrees, and it was not limited by link capacity and reflected practice link condition.
| Original language | English |
|---|---|
| Pages (from-to) | 446-449 |
| Number of pages | 4 |
| Journal | Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) |
| Volume | 33 |
| Issue number | 3 |
| Publication status | Published - Jun 2009 |
Keywords
- BPR function
- Congest
- Link performance function
- Traffic density
- Traffic quantity