Vehicle knowledge, tyres, lights and maintenance
Vehicle knowledge questions test the checks a driver can make and the legal minimums for tyres, lights and basic equipment. You do not need to be a mechanic, but you must recognise unsafe conditions.
Tyres
The legal minimum tread depth for car tyres is 1.6 mm across the main tread. Winter tyres are not compulsory in Denmark, but in winter conditions the tyres must provide adequate grip; M+S or three-peak mountain snowflake tyres are the usual choice. Check pressure when tyres are cold and follow the vehicle manufacturer's figures; under-inflation increases fuel use, heat and wear. Look for cuts, bulges and uneven wear, which can indicate alignment or suspension problems.
Lights
Check that dipped headlights, main beam, indicators, brake lights and rear fog lights work. Dipped lights are required in darkness, rain and fog; daytime running lights are acceptable in clear daylight. Front fog lights may be used in fog, rain or snow, but rear fog lights only when visibility is seriously reduced, generally below 50 m; they dazzle following drivers. Replace failed bulbs promptly.
Other checks and loading
Check brake fluid, coolant, engine oil, washer fluid and wiper blades. Treat a red warning light as a stop-and-check signal; an amber light means investigate soon. Secure loads so they cannot move or fall. Do not exceed the maximum permitted mass or axle loads. A trailer needs correct coupling, lights and safety connection.
Worked example
A tyre measures 1.4 mm on the central tread. The legal minimum is 1.6 mm, so the tyre is illegal and must be replaced. Do not wait for the next service. If the wear is uneven across the tyre, have the alignment checked as well; a new tyre on a misaligned car will wear quickly.
Traps
Thinking 1.6 mm is enough for snow; using rear fog lights in ordinary rain; ignoring an amber warning light; and overloading the car or trailer.