The Highway Code guidance states that before entering fog drivers should:
'... 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.'
Driving more slowly, and with greater care may seem obvious, but there are a few more tips that may be useful. The Basingstoke-based AA have compiled a list of advice for people who may have to drive in fog. Among the tips put forward are:
Familiarise yourself with your front & rear fog lights - know how to switch them on and off
Beware of other drivers not using headlights
Be able to stop within the distance you can see clearly - particularly important on motorways & dual carriageways, as vehicles are travelling faster.
Air passengers in the South East were facing delays and cancellations due to early morning fog.
Gatwick, Heathrow and London City airports were affected by the poor weather, with British Airlines having to cancel seven flights from Heathrow.
London City airport said, "Due to low visibility this morning, flights to and from London City Airport are experiencing disruptions. Passengers are advised to contact their airlines for more information."
Gatwick airport has reopened its main runway after fog and maintenance works caused 1,500 passengers to be diverted to other airports. A spokesman said the main runway reopened at 5.25am and no major delays are expected today although there could be minor disruption to some flights.
A total of 24 flights were unable to land at Gatwick. Engineers were carrying out planned maintenance work to the main runway overnight, leaving just the second landing strip open. The fog meant flights had to be diverted to Stansted, Luton, Bristol and Heathrow from around 12.10am onwards.
Around 1,500 airline passengers faced disruption overnight after they were diverted away from Gatwick Airport due to fog and maintenance work. A total of 24 flights were forced to touch down at other UK airports due to the combination of poor visibility and runway repairs, a Gatwick spokesman said.
Engineers were carrying out planned maintenance work to the airport's main runway overnight, leaving just the second landing strip open. But the fog meant short and medium-haul flights had to be diverted to Stansted, Luton, Bristol and Heathrow from around 12.10am onwards.