Environmental driving and fuel-efficient operation
What this domain tests
This section checks whether you can plan and drive a C1E combination economically without sacrificing safety. Efficient driving reduces fuel, brake wear, and emissions, but it must not mean coasting or breaking speed limits.
Planning and smoothness
Plan routes to avoid unnecessary detours and congested junctions. Combine errands and deliveries where possible. Start gently; a loaded combination uses a lot of fuel to accelerate. Look ahead and anticipate stops so you can ease off early instead of braking late.
Gear and speed
Use the highest practical gear without labouring the engine. Change up early and keep engine speed moderate. On motorways, observe the 80 km/h limit for a lorry with trailer; driving faster is illegal and increases fuel consumption sharply. Use cruise control only on suitable roads and never in heavy traffic or on slippery surfaces.
Idling and maintenance
Switch off the engine during longer stops if it is safe and the vehicle does not need to run for equipment. Avoid long warm-up idling. Correct tyre pressure reduces rolling resistance. Keep the vehicle serviced; a dirty air filter or binding brake wastes fuel. Remove unnecessary load and roof equipment that adds drag.
Worked example
A driver approaches a red light 300 metres ahead. Option A: keep the accelerator down and brake hard at the line. Option B: ease off early, let the combination slow smoothly, and arrive as the light changes. Reasoned answer: Option B is better. It uses less fuel, reduces brake wear, and keeps the trailer settled. The driver must still use the brakes to stop if the light does not change; engine braking alone is not a substitute for safe stopping.
Traps that cost marks
- Coasting in neutral to save fuel; it reduces control.
- Driving above the 80 km/h motorway limit for a lorry with trailer.
- Using cruise control on a slippery road.
- Leaving the engine idling for long periods.
- Ignoring tyre pressure because it is only a trailer.
- Removing load securing to save time; never trade safety for fuel.