Fundamental relationship of the traffic flow交通流流密速关系阐述
Resource: Northwestern University, Yu(Marco) Nie, CIV-ENG 376 Lecture Notes
Notations 符号
| Symbols | Meaning |
|---|---|
| $q$ | Flow rate(pcu/h, vph) 流量 (How much the traffic flows) |
| $k$ | Density(pcu/km, vpm) 密度 (How crowd the road is) |
| $u$ | Space mean speed(km/h, mph) 空间平均速度 (how fast the traffic moves) |
| $\bar{v}$ | Time mean speed(km/h, mph) 时间平均速度 |
| $T$ | A period of time(h, min, s) 时间 |
| $N$ | Numbers of vehicles 车辆数量 |
| $x$ | Location 位置 |
| $t$ | A moment 时刻 |
| $h$ | Headway(s) 车头时距 |
| $s$ | Spacing (m, ft) 车头间距 |
| $i$ | index of vehicle 车辆编号 |