抄録
This paper investigates urban expressway capacity characteristics of lane closure sections due to accident. The methodology includes the following parts: 1) identification of a breakdown due to an accident, 2) estimation of capacity under accident conditions, 3) exploring features of capacity drop percentage, and 4) fitting probability distribution of capacity drop percentage. The results reveal that mean capacity value increases and its variance turns to be convergent with increase of lane closure duration. It is found that a higher possibility of greater capacity drop percentage exists under accident conditions. More severe accident types such as multiple rear-end collisions and rear-end collisions result in comparatively greater values of capacity drop percentage. Furthermore, capacity drop percentage is shown to be stochastic, and beta distribution can well fit its probability distribution.
