What must a driver do before starting to overtake?
Explanation
Before overtaking, the driver has to run through a series of safety checks: the road ahead (is the lane clear), behind (is anyone already overtaking them), and the vehicle being passed. These precautions are essential to avoid a collision.
KET reference: KET 136: before overtaking, the driver must take extra care and make sure that: 136.1. no driver behind has started to overtake them; 136.2. the driver of the vehicle being overtaken is not signalling a left turn; 136.3. the part of the lane needed for overtaking is clear.