Wind
The sustained wind speed across the road, averaged rather than peak, and the compass direction it blows from.
- APPLIES TO
- ALL DEVICES
- LEARN SHEET
- WIND
- UPDATED
- 27 SEP 2026
What it measures
The sustained wind at this section — the speed the air moves across the road, averaged rather than at its peak — and the compass direction it blows from. 18 mph NW is a wind from the north-west. The strongest bursts are a separate reading, Gusting.
Why it matters on the road
A crosswind pushes the car sideways, and the push is steady until the road turns or a line of trees breaks — which is where it stops being steady. Open plains, bridge decks, cuttings and the gap beside a passing lorry are where you feel it. Tall and light vehicles, and anything towing, feel it most.
How it is marked
Crosswinds push the car. Hold the wheel with both hands.
40 km/h · 25 mph
Where a high-sided vehicle should wait.
56 km/h · 35 mph
A mark describes this reading alone. A section rated CAUTION for rain stays CAUTION with a strong wind in it; see Severity.
Something missing or wrong on this page?