It is possible to cause traffic signal equipment to fail through cyber attacks, thereby causing urban traffic chaos. As urban transportation systems increasingly adopt electronic and network technologies, key infrastructure such as traffic signal equipment is increasingly closely connected to the network. If attackers with certain network technology capabilities can find and exploit network vulnerabilities in the traffic signal system: - They can tamper with the control logic of traffic signals, such as changing the normal switching time of traffic lights, making all traffic lights display the same color, etc. - Interfere with signal transmission, causing traffic signal equipment to be unable to receive correct instructions, resulting in abnormal signal display or complete failure. Once traffic signal equipment fails, it will seriously affect the orderly passage of vehicles and pedestrians on the road, easily causing traffic accidents and traffic congestion, and then causing the entire city traffic to fall into chaos. In recent years, cybersecurity threats to critical infrastructure have continued to increase, and relevant departments have also been continuously strengthening protection measures to deal with such risks.