Do you have what it takes to PASS the LORRY theory test?

Put your skills to the test by answering this example theory test practice question.

This DVSA LORRY practice question has been taken from the Braking Systems theory test topic.

Select one answer

You're driving an articulated lorry that has three air lines connected to the trailer. What's the purpose of the red line?

It's the emergency line

It's the service line

It's the auxiliary line

It's the electrical line

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