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Correct!

When should an anti-lock braking system (ABS) warning light turn off?

When the brakes are used for the first time
When the ABS comes into operation
When road speed is 6 mph (10 km/h) or more
Correct answer
When the secondary braking system is used

DVSA theory test explanation

Every vehicle fitted with anti-lock brakes must have a warning light in the cab of the vehicle. The warnings may differ between manufacturers, but on all types the warning light should come on when the ignition is switched on, and turn off when the vehicle reaches a speed of 6 mph (10 km/h). If the light stays on, there may be a fault; you should have the brakes checked before continuing your journey.

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