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Why is it bad technique to coast when driving downhill?

A The vehicle will gain speed
Coasting is when you allow the vehicle to freewheel in neutral or with the clutch pedal depressed. Speed will increase as you lose the benefits of engine braking and have less control. You shouldn't coast when approaching hazards such as junctions or bends and when travelling downhill.
B The fuel consumption will increase
C The engine will overheat
D The tyres will wear more quickly