Traffic congestion on urban roads is forcing city authorities to look at innovative transportation solutions. Traffic simulation and other advanced technologies have been used to provide solutions for maximizing the capacity of urban transportation networks and to evaluate and optimize traffic management and signal settings. The authors have investigated about 10 urban signalized intersections to evaluate the adopted traffic organization and signal settings in Beijing. One of these intersections was taken as example to illustrate how to assess the effectiveness of ameliorative measures using the microscopic simulation model.