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Rule 234 ↗
Before entering fog check your mirrors then slow down.
If ‘Fog’ is shown on a sign 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 Safely in Fog :
A Guide to Rule 234
IMMEDIATE ACTIONS BEFORE ENTRY
Check Your Mirrors
Before entering a fog bank , assess the traffic behind you to ensure you can slow down safely without causing a rear - end collision .
INTERPRETING ROAD SIGNS
Reduce Your Speed
Slow down proactively before you reach the fog to account for the sudden drop in visibility and increased reaction time needed .
Trust the Signs , Even if the Road is Clear
If a roadside sign displays " Fog " do not ignore it just because the current view is clear ; it is a warning of conditions immediately ahead .
Anticipate Drifting Patches
Be prepared for " drifting patchy fog " which can create inconsistent visibility across different stratches of the road .
THE DECEPTION OF CLEARING FOG
The Sudden Bank Risk
Drivers should stay alert for sudden , dense banks of fog that can appear without warning , drastically reducing visibility in seconds .
Avoid Early Acceleration Even if the fog appears to be clearing , remain cautious , as you can suddenly find yourself back in thick fog without notice .
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