Question Topic: The Driver
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Explanation: Power-assisted steering operates when the engine is running. If a fault develops, much greater effort is required to turn the steering wheel. Don't attempt to drive a vehicle if you're aware of a fault in the power-steering system.
Category: The Driver
References: The Official DVSA Guide to Driving Buses and Coaches: Section 1, The Official DVSA Guide to Driving Goods Vehicles: Section 6