When changing lanes or merging, how many seconds of gap in traffic is recommended?

When changing lanes or merging, a gap of 4 seconds in traffic is recommended to ensure a safe and adequate buffer zone between vehicles. This 4-second rule allows drivers enough time to assess the space available and safely navigate into the new lane without cutting off or colliding with other vehicles.

This time frame provides an opportunity for drivers to react to any sudden changes in the distance or speed of the vehicles around them, ensuring that they have adequate time to adjust their speed or path if necessary. It also considers factors such as reaction times, vehicle speed, and road conditions, which can affect how quickly a vehicle can accelerate or decelerate.

Having a 4-second gap fosters more cautious driving behavior and helps to prevent accidents, especially in high-traffic situations or at higher speeds where stopping distances are longer. While shorter gaps can sometimes feel sufficient, particularly for experienced drivers, maintaining a 4-second gap is a safer standard for all drivers, contributing to overall road safety.