Catalogue section 3.17

Supplementary panels (S-800–S-892)

They pin down what the sign above them means: distance, length, times or which vehicles are affected.

How to recognise them: A rectangular plate with a white background and a black border, fitted below another sign.

How this group is laid out

A supplementary panel is never read on its own: it pins down what the sign above it means, by limiting where it applies, to whom or when. Some say where. S-800 gives the distance to the point where the hazard or rule begins, and S-810 the length of the stretch affected. Under a prohibition sign, S-820 and S-821 say how far it runs in the direction of their arrow, and S-830 how far in each of the two directions. S-870a and S-870b restrict the sign to the exit slip road that runs the way the arrow points.

Others say to whom or when. The S-880 panels narrow the sign to particular vehicles, from lorries to personal mobility vehicles, and the S-890 panels to snow, rain or fog. Some only ever go with one particular sign: S-840, under a give-way sign, tells you how far ahead the STOP at the next junction is, and S-850 to S-853 go with R-3 to show the priority route. S-891 reminds you of the minimum clearance when overtaking a cycle or moped, S-892 warns of automatic enforcement, and S-860 is for any other clarification.

How to tell them apart

Signs in this group that look alike, and what separates them according to their definitions.

S-800 S-810
S-800 says how far ahead the hazard or rule begins; S-810 over how long a stretch it applies. Under the road-narrows sign, S-800 may instead give the width left free.
S-820 S-830
Both go under a prohibition sign and say how far it applies. S-820 does so in the direction of its arrow; S-830 gives a distance for each direction.
S-880a S-890a
S-880a makes the sign refer only to lorries. S-890a makes it apply only when there is snow.
S-840 S-800
Both give a distance, but S-840 only goes under a give-way sign and tells you how far ahead the STOP sign at the next junction is. S-800 gives it to the hazard or rule of the sign it goes with.
S-850 S-851 S-852 S-853
All four are additional panels for R-3 and share one definition: they show the priority route. What changes between them is the layout they draw.