What is the recommended gap in oncoming traffic when making a safe left-hand turn at an intersection without a stoplight?

When making a left-hand turn at an intersection without a stoplight, it is crucial to ensure that there is a sufficient gap in oncoming traffic to make the turn safely. A gap of 4 seconds is generally recommended because this time frame allows a driver to judge the approach speed of oncoming vehicles accurately and to execute the turn without the risk of colliding with them. This time also accommodates the driver's need to check for pedestrians and any other potential hazards present at the intersection.

The 4-second gap is considered optimal as it provides a balance between safety and efficiency, allowing the driver to make the turn without lingering in the intersection. A shorter period may not offer adequate reaction time to unexpected situations, while a longer wait can lead to confusion for drivers behind you who may not understand why you're not proceeding.