When turning left onto a two-way street, what is the suggested gap to oncoming vehicles from the left?

When turning left onto a two-way street, it is essential to ensure that there is enough of a gap in oncoming traffic to execute the turn safely without causing disruption or endangering yourself or other drivers. The recommendation of a 4-second gap to oncoming vehicles from the left is based on the need to assess the speed of oncoming traffic accurately and allow sufficient time to make a safe left turn.

This 4-second rule takes into account the average speed of vehicles, typically around 30 to 50 mph in urban settings. By using a 4-second gap, drivers can reasonably predict the distance and time available for making the turn safely. It enables drivers to avoid potential collisions with vehicles that may be approaching at a higher speed.

This timeframe also provides a buffer for unexpected situations, such as a sudden change in the traffic flow or an approaching vehicle that may not be visible until the driver is positioned to turn. This careful assessment and timing help enhance roadway safety for all users.