Traffic calming
Road hump to the right and at 20 yards
What it means
Short notice: a road hump just 20 yards away, in the road the arrow points to. You will typically see this right at a junction or entrance, where the hump sits almost immediately after the turn. Get your braking done before you turn in - 20 yards is no distance at all once you are committed to the corner.
Highway Code Rule 153 — read it on GOV.UK
Test yourself on signs like this one
Free with an account. Each answer tells you what the sign means, not just whether you were right.