Importance of safe gap selection:
Selecting safe gaps in traffic when turning, overtaking or changing lanes is a key hazard perception skill. Gap selection is also very important at intersections. Crashes can occur when a driver selects a gap that is too small and collides with another vehicle.

What is a safe gap?
A safe gap is one that enables you to turn, overtake, change lanes or cross an intersection without being involved in a crash or endangering other road users. This means that no other road users should need to take action to avoid your vehicle. For example, if you make a left turn from a side street onto a main road and the traffic on the main road has to brake heavily or change lanes to avoid colliding with you, the gap was not safe.

If a gap is not large enough it is unsafe and you should not go. Remember, good hazard perception is as much about recognising when to stay as when to go.