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Difficulty: HardEnvironmental Impact and Fuel Efficiency

When driving through busy urban traffic with frequent queues and traffic signals, which driving technique will reduce both fuel consumption and exhaust emissions most effectively?

  1. A
    Depressing the clutch pedal and coasting in neutral towards red traffic lights to keep engine revs at idle
  2. B
    Focusing closely on the vehicle immediately ahead and accelerating promptly to close gaps in traffic
  3. Anticipating road conditions well ahead to maintain a steady rolling pace and avoid coming to a complete standstillAnswer
  4. D
    Reducing tyre pressures below manufacturer specifications to increase surface contact and improve stop-start traction

Answer

Anticipating road conditions well ahead to maintain a steady rolling pace and avoid coming to a complete standstill
Anticipating changes in traffic and signal phases ahead allows a driver to adjust speed smoothly and keep the vehicle rolling. Preserving rolling momentum avoids the substantial energy and fuel consumption required to move a stationary vehicle away in first gear.

Step-by-Step Solution

1
Analyse the energy demands of stop-start urban driving
Recognised that accelerating a vehicle from a complete stop demands significantly more kinetic energy and fuel than sustaining moderate rolling momentum.
Overcoming static inertia requires low gears and high engine torque, resulting in peak fuel burn and exhaust emissions.
2
Evaluate eco-safe driving techniques endorsed by the DVSA
Identified that scanning ahead allows the driver to adjust speed early using engine braking and deceleration rather than abrupt braking.
Maintaining smooth progression through anticipation eliminates harsh throttle applications and unnecessary stops.

Key Concept

Eco-safe driving through hazard anticipation and momentum conservation
Estimated Time:1m 0s
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Topics

Environmental Impact and Fuel Efficiency

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