Traffic Status Evolution Trend Prediction Based on Congestion Propagation Effects under Rainy Weather

Table 2

Evaluation indexes of road congestion level.

Level	I	II	III	IV
Average speed (km/h)	≥45	35∼45	20∼35	≤20
Speed performance indexes	0.86∼1	0.66∼0.85	0.41∼0.65	≤0.40