A vehicle driver must slow down when he:
- Overtakes on a two-way road.
- Arrives to the beginning of a steep uphill climb.
- Overtakes on a one-way road.
- Correct answer: Drives down a steep or long descent.
Why this is the answer
The correct answer in the official bank: Drives down a steep or long descent.
On a steep or long descent, gravity increases the vehicle's speed, the stopping distance gets longer, and the brakes can overheat and lose effectiveness. So you must slow down and keep a controlled speed, preferably using a low gear as well.