When ramp meters or lights are in operation, how many cars are allowed to proceed on each green light?

In traffic management, ramp meters are designed to control the flow of vehicles entering a highway, reducing congestion and improving safety. When ramp meters or lights are activated, they typically allow only one car to proceed on each green light. This helps to ensure that traffic from the ramp merges smoothly into the highway without creating a bottleneck.

Allowing a single vehicle to enter at a time ensures that there is enough space for each car to merge safely, reducing the chance of accident and maintaining a steady flow of traffic on the main road. The timing of the green light is crucial because it needs to accommodate various factors like traffic volume and speed on the highway.

In contrast, more than one vehicle permitted to enter at once could lead to a chaotic merge and could disrupt the flow of traffic on the main roadway, potentially creating safety hazards. Thus, the system is calibrated to optimize safety and efficiency by allowing just one car per green light cycle.