How many seconds of a gap do you need to safely merge into traffic?

To safely merge into traffic, a gap of about 4 seconds is recommended. This timeframe provides the driver with sufficient space to enter the traffic flow without causing disruption or compromising safety. A 4-second gap allows you to assess the speed of approaching vehicles and makes it easier to judge the right moment to merge. It also gives you enough time to react if any unforeseen circumstances arise, such as a sudden change in the speed of other vehicles.

While shorter gaps may seem adequate, they may not provide enough reaction time or room for error, especially in fast-moving traffic. A 4-second gap helps ensure that you can accelerate to a compatible speed and merge smoothly, reducing risks for both you and other drivers.