AAATHE 5.Fog  234. Before entering fog   check your mirrors then slow down. If the  word ‘Fog’ is shown on a roadside signal but the road is clear, be  prepared for a bank of fog or drifting patchy fog ahead. Even if it  seems to be clearing, you can suddenly find yourself in thick fog.  235. When driving in fog   you should  ● use your lights as required (see Rule 226)  ● keep a safe distance behind the vehicle in front. Rear lights  can give a false sense of security  ● be able to pull up well within the distance you can see  clearly. This is particularly important on motorways and dual  carriageways, as vehicles are travelling faster  ● use your windscreen wipers and demisters  ● beware of other drivers not using headlights  ● not accelerate to get away from a vehicle which is too close  behind you  ● check your mirrors before you slow down. Then use your  brakes so that your brake lights warn drivers behind you that  you are slowing down  ● stop in the correct position at a junction with limited  visibility and listen for traffic. When you are sure it is safe to  emerge, do so positively and do not hesitate in a position  that puts you directly in the path of approaching vehicles.  236. You MUST NOT   use front or rear fog lights unless visibility is  seriously reduced (see Rule 226) as they dazzle other road users  and can obscure your brake lights. You MUST   switch them off when  visibility improves.  highwaycodeuk.co.uk 122 