An incorrectly adjusted head restraint will offer reduced protection against whiplash injury. When adjusting the head restraint, set it so that it's at least as high as the eyes or top of the ears.

At a pelican crossing, there's a phase where the amber light flashes. This will show after the red light and gives pedestrians time to finish crossing safely. For drivers, the flashing amber light means they may drive on if the crossing is completely clear, but they must wait if pedestrians are still on the crossing.

This sign means it's illegal to overtake. It may have a black-and-white plate telling you over what distance the prohibition applies. There will normally be a sign with an 'End' plate where the prohibition ends.

Where there's a hidden dip (dead ground), you should be aware that there could be oncoming vehicles out of sight between you and the road in the distance. Don't start to overtake until you can see into the dip and know the road ahead is clear.

The entry sign to a controlled parking zone will show the times of operation. Inside the zone, yellow lines indicate where waiting is prohibited. Yellow time plates are provided where a yellow-line restriction operates at different times from those shown on the entry sign.

In general, the vehicle handbook will recommend higher tyre pressures for continuous high-speed driving; for example, on long motorway trips. Increased tyre pressures may also be recommended when the vehicle is carrying a heavy load or when towing a trailer.

Curving direction arrows are often found painted on the road before solid double white lines and hatch markings; they indicate the direction you should pass them. They're also painted on the road on the approach to low arched bridges, to mark the route high vehicles should take.

If you drive at speed in very wet conditions, your steering may suddenly feel lighter than usual. This means that the tyres have lifted off the surface of the road and are skating on the surface of the water. This is known as aquaplaning. Reduce speed by easing off the accelerator, but don't brake until your steering feels normal again.

Spilled fuel wastes money, damages the environment and makes the road surface slippery. This can be particularly dangerous for motorcyclists. Ensuring that you replace the fuel filler cap securely will prevent fuel spilling from your vehicle's fuel tank.

Make sure you know what the different warning lights mean. An illuminated warning light could mean that your car is unsafe to drive. Don't take risks. If you're not sure about the problem, get a qualified mechanic to check it.

When all four wheels are driven, there's less chance of the tyres losing their grip, compared with a two-wheel-drive vehicle. But this doesn't replace the skills you need to drive safely. The extra grip helps to prevent skidding when travelling on slippery or uneven roads.

If your tyres don't have enough air in them, they'll drag against the surface of the road. This makes the steering feel heavy. As well as affecting steering, under-inflated tyres can affect braking, cornering and fuel consumption.

You may use hazard warning lights when you slow suddenly on a motorway or unrestricted dual carriageway, to warn traffic behind of a hazard ahead. Never use hazard warning lights to excuse dangerous or illegal parking.

In icy and snowy weather, your stopping distance will be up to 10 times further than in good, dry conditions. To reduce the risk of skidding, take extra care when braking, accelerating and changing direction.

Most motorway signs have a blue background with white lettering, numbers and borders. These signs not only confirm motorway status but are designed to give clear information to drivers travelling at motorway speeds.

Where there are double white lines in the middle of the road and the line nearest to you is broken, you may cross the lines to overtake, provided it's safe and you can complete the manoeuvre before reaching a solid white line on your side.

You may only stop on the carriageway of a motorway
- when told to do so by the police
- when a red cross with flashing red lights shows above every lane - in a traffic jam
- in an emergency or breakdown.

If the lights change to green at a pelican crossing, wait for any pedestrians to finish crossing. Allow them to cross the road in their own time, and don't try to hurry them by revving your engine.

Keep well back and allow the cyclist room to take up the correct position for the turn. Don't get too close behind or try to squeeze past.

Traffic signs and continuous red lines painted along the edge of the road identify a Red Route. Parking is banned along these routes and enforcement officers have powers to remove any vehicle that's illegally parked. These powers are in place to ensure the route remains unobstructed and so help the free flow of traffic.