What should I do when the speed limit suddenly changes from 120 to 60 on the highway?

[Jill]

It is essential to remain calm in the face of such sudden situations. Most of these low-speed limit signs on highways are invalid, as they were set up during the initial construction phase for road safety purposes, and typically, there are no dedicated electronic monitoring devices in the vicinity. Simply control your speed reasonably and pass through without slamming on the brakes. Below are the reasons for speed limits on highways: 1. Speed limits for fuel efficiency. 2. For safety: When the speed exceeds a certain level, the vehicle body can no longer withstand the collision energy, and neither airbags nor seat belts can reduce the harm caused to passengers. Another critical factor is the highway's own protective design; when the speed exceeds the limit, the guardrails on both sides of the road lose their protective function.