Mark one answer
One vehicle length
Two vehicle lengths
At least a one-second gap
At least a two-second gap
Explanation: Tailgating' - travelling too close to the vehicle in front - is very dangerous, because it doesn't give you enough distance to stop safely. Leave at least a two-second gap in good conditions, and increase this to four seconds in wet weather.
Category: The Road
References: The Official DVSA Guide to Driving Buses and Coaches: Section 4, The Official DVSA Guide to Driving Goods Vehicles: Section 4, Highway Code: Rule 126
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