Abstract
Most nonsignalized T-shaped intersections permit U-turn movements, which make the traffic conditions of intersection complex. In this paper, a new cellular automaton (CA) model is proposed to characterize the traffic flow at the intersection of this type. In present CA model, new rules are designed to avoid the conflicts among different directional vehicles and eliminate the gridlock. Two kinds of performance measures (i.e., flux and average control delay) for intersection are compared. The impacts of U-turn movements are analyzed under different initial conditions. Simulation results demonstrate that (i) the average control delay is more practical than flux in measuring the performance of intersection, (ii) U-turn movements increase the range and degree of high congestion, and (iii) U-turn movements on the different direction of main road have asymmetrical influences on the traffic conditions of intersection.
Highlights
U-turn movements increase the complexity of urban intersections
The effect of U-turn movements at nonsignalized intersections was ignored. For these reasons and based on the former work in [23], this paper proposes a new cellular automaton (CA) model to characterize the nonsignalized T-shaped intersection with U-turns
The detector is set at the 490th cell on each lane upstream the intersection to obtain the flux by counting the number of vehicles in 20000 time steps
Summary
U-turn movements increase the complexity of urban intersections. it is applied more and more widely. The effects of U-turn movements on the safety and operation of intersections have attracted great research interests These studies can be substantially categorized into using the analytical models [1,2,3,4,5,6,7,8] and simulation techniques [9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Movements of rank 3 include left-turning traffic stream from the minor street. Right-turning vehicle in lane C Figure 2: Type of nonsignalized T-shaped intersection. If the position of first vehicle on lane A, B, and D is larger than the length of lane, the vehicle will be removed, and the following vehicle will be the new leading vehicle
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
