The signal timing scheme cannot solve the congestion problem.

The traffic signal timing scheme cannot solve the congestion problem, which may be due to the following reasons:

1, traffic flow is too large: the traffic flow on the road is too large, even if the signal timing scheme is optimized, the congestion problem cannot be completely solved. Because there are too many vehicles, it is impossible to pass through the intersection in a short time, resulting in a backlog of vehicles and traffic congestion.

2. Unreasonable road design: Unreasonable road design, such as too narrow lanes and too small intersections, will also lead to traffic congestion. In this case, even if the signal timing scheme is optimized, the road congestion will not be improved.