查看文章

The predictions of capacity and delay for a single lane entry stream at a single lane roundabout by two simulation models, ModelC and INSECT, and two analytical models, ARRB Special Report 45 (SR 45) and SIDRA, are compared. All these models are based on the use of gap acceptance method for predicting roundabout performance. Comparisons are made for low, medium and high circulating flow levels, and for undenaturated entry stream conditions (degrees of saturation in the range 0.10 to 0.95). The features of the models in relation to capacity and delay estimation are discussed in detail. The capacities and queueing delays predicted by ModelC simulation model and the two analytical models, SR 45 and SIDRA are found to be sufficiently close given the difficulty in making the analytical and simulation model assumptions compatible. Estimates of capacity and delay from INSECT are found to be over …