Index interval | Level | State Interpretation |
[0, 2) | Smooth | There is basically no congestion. You can drive according to the road speed limit. |
[2, 4) | Basic smooth | A small amount of congestion, you need 0.2 to 0.5 times longer than smooth traffic. |
[4, 6) | Mild congestion | Some roads, you need more than 0.5 to 0.8 times longer than unblocked traffic. |
[6, 8) | Moderate congestion | A large number of roads, you need more than 0.8 to 1.1 times longer than smooth traffic. |
[8, 10) | Severe congestion | Most of the city’s road are congested, you need 1.1 times more than smooth. |