On what type of road surface may anti-lock brakes not work effectively?

Poor contact with the road surface could cause one or more of the tyres to lose grip on the road. This is more likely to happen when braking in poor weather conditions and when the road has a loose, slippery or uneven surface.

You may also be interested in these theory test questions

Overall stopping distance is made up of thinking distance and braking distance. You’re on a good, dry road surface, with good brakes and tyres. What’s the typical braking distance from 50 mph?

When approaching a right-hand bend, you should keep well to the left. Why is this?

You’re driving in freezing conditions. What should you do when approaching a sharp bend?

What can result when you travel for long distances in neutral (known as coasting)?

You’re driving along a country road. You see this sign. What should you do after dealing safely with the hazard?

You’re following other vehicles in fog. You have your lights on. What else can you do to reduce the chances of being in a collision?