What it means
The S-840 sign gives advance notice of a mandatory stop. It acts as an advance panel warning that farther ahead there will be a sign or situation requiring you to stop, so you must prepare to reduce speed in time. It does not replace the main stop sign or by itself indicate the exact point where to stop. It is usually placed before intersections, controls, crossings, or places where it is useful to anticipate the stop to avoid harsh braking. When you see it, increase attention and prepare to stop where required. In the test they often ask that it is advance notice, not the final stop order.
- CategoryInformation signs
- ShapeRectangular or square, blue
Practise DGT questions featuring this sign
Ten DGT 2026 exam-style questions about signs, with an explanation after each. Free, no signup.
Other related signs
S-242
Gives advance information on a motorway or dual carriageway for two very close exits toward any road
S-242A
Gives advance information on a motorway or dual carriageway for two very close exits toward any road and the continuing direction
S-250
Gives advance notice of an itinerary
S-260
Gives advance information about lanes
S-261
Advance signing on a conventional road for a service zone or area
S-263
Gives advance information on a motorway or dual carriageway for a service zone or area with a shared exit
S-263A
Gives advance information on a motorway or dual carriageway for a service zone or area with an exclusive exit
S-264
Gives advance information on a conventional road for a service road