Saturation Flow Rate and Start-up Lost Time of Dual-left Lanes at Signalized Intersection in Rainy Weather Condition

This study aims at finding out the difference of saturation flow rate and start-up lost time at dual left lanes between normal and rainy weather. It is based on the investigation of a signalized intersection in Shanghai. The result shows that compared to clear weather, saturation flow in rainy weather decreases by 3-7 percent and each lane's start-up lost time rises by 21-31 percent. However, comparing light-medium rainy weather to clear weather, the statistical difference of each of these two parameters is not significant.