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You're leaving your vehicle parked on a road and unattended. When may you leave the engine running? You're leaving your vehicle parked on a road and unattended. When may you leave the engine running?

  • Possible answers:

  • A. If you'll be parking for less than five minutes

  • B. If the battery keeps going flat

  • C. When parked in a 20 mph zone

  • D. Never if you're away from the vehicle


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General rules, techniques and advice for all drivers and riders: Control of the vehicle


Rule 117

In normal circumstances. The safest way to brake is to do so early and lightly. Brake more firmly as you begin to stop. Ease the pressure off just before the vehicle comes to rest to avoid a jerky stop.

Rule 118

In an emergency. Brake immediately. Try to avoid braking so harshly that you lock your wheels. Locked wheels can lead to loss of control.

Rule 119

Skids. Skidding is usually caused by the driver braking, accelerating or steering too harshly or driving too fast for the road conditions. If skidding occurs, remove the cause by releasing the brake pedal fully or easing off the accelerator. Turn the steering wheel in the direction of the skid. For example, if the rear of the vehicle skids to the right, steer immediately to the right to recover.


Rule 120

ABS. If your vehicle is fitted with anti-lock brakes, you should follow the advice given in the vehicle handbook. However, in the case of an emergency, apply the footbrake firmly; do not release the pressure until the vehicle has slowed to the desired speed. The ABS should ensure that steering control will be retained, but do not assume that a vehicle with ABS will stop in a shorter distance.

Rule 121

Brakes affected by water. If you have driven through deep water your brakes may be less effective. Test them at the first safe opportunity by pushing gently on the brake pedal to make sure that they work. If they are not fully effective, gently apply light pressure while driving slowly. This will help to dry them out.

Rule 122

Coasting. This term describes a vehicle travelling in neutral or with the clutch pressed down. It can reduce driver control because

The Driver and the Environment

Rule 123

You MUST NOT leave a parked vehicle unattended with the engine running or leave a vehicle engine running unnecessarily while that vehicle is stationary on a public road. Generally, if the vehicle is stationary and is likely to remain so for more than a couple of minutes, you should apply the parking brake and switch off the engine to reduce emissions and noise pollution. However it is permissible to leave the engine running if the vehicle is stationary in traffic or for diagnosing faults.
Law CUR regs 98 & 107

Speed limits

Rule 124

You MUST NOT exceed the maximum speed limits for the road and for your vehicle (see the table below). The presence of street lights generally means that there is a 30 mph (48 km/h) speed limit unless otherwise specified.
Law RTRA sects 81, 86, 89 & sch 6

Rule 125

The speed limit is the absolute maximum and does not mean it is safe to drive at that speed irrespective of conditions. Driving at speeds too fast for the road and traffic conditions is dangerous. You should always reduce your speed when

Speed Limits

Type of vehicle Built-up areas* Single carriageways Dual carriageways Motorways
  MPH(km/h) MPH (km/h) MPH (km/h) MPH(km/h)
Cars & motorcycles(including car derived vans up to 2 tonnes maximum laden weight) 30(48) 60 (96) 70 (112) 70 (112)
Cars towing caravans or trailers (including car derived vans and motorcycles) 30(48) 50 (80) 60 (96) 60 (95)
Buses, coaches and minibuses (not exceeding 12 metres in overall length 30(48) 50 (80) 60 (96) 70 (112)
Goods vehicles (not exceeding 7.5 tonnes maximum laden weight) 30(48) 50 (80) 60 (96) 70† (112)
Goods vehicles (exceeding 7.5 tonnes maximum laden weight) 30(48) 40 (64) 50 (80) 60 (96)

*The 30 mph limit usually applies to all traffic on all roads with street lighting unless signs show otherwise. †60 mph (96 km/h) if articulated or towing a trailer

Rule 126

Stopping Distances. Drive at a speed that will allow you to stop well within the distance you can see to be clear. You should

If you have to stop in a tunnel, leave at least a 5-metre gap between you and the vehicle in front.


Typical stopping distances


At 20mph thinking distance is 6m and braking distance is 6m giving a total of 12m

At 30mph thinking distance is 9m and braking distance is 14m giving a total of 23m

At 40mph thinking distance is 12m and braking distance is 24m giving a total of 36m

At 50mph thinking distance is 15m and braking distance is 38m giving a total of 53m

At 60mph thinking distance is 18m and braking distance is 55m giving a total of 73m

At 70mph thinking distance is 21m and braking distance is 75m giving a total of 96m