What is the principle of traffic lights?

Physical principle of lamp: use colored glass to absorb light of other colors, and only let red pass through green.

1. Set traffic light signal control parameters at each intersection to minimize the delay time of traffic flow in all directions at the intersection.

2. When the signals of multiple intersections are interlocked for green wave control, while ensuring the formation of two-way green wave bands, we should strive to meet the above conditions and achieve the widest green wave bandwidth.

3. Establish a time-sharing model of traffic flow, such as daily time division, and establish a flow matrix for each time period every day.

4. Solve the optimal timing scheme table for each time period,

5. Set the parameters of the controller according to the timing table, and ensure its normal action on time.

6. Reconstruct the flow model seasonally and solve the parameter optimization again.