C20 Prohibition Sign – No Vehicles Longer than 10 m, Ø60 cm, Class I

C20 Prohibition Sign – No Vehicles Longer than 10 m, Ø60 cm, Class I

The C20 stops vehicles and combinations longer than 10 m before a place they cannot get through: a tight bend, a narrow junction or an old street. The symbol is a lorry with a full-length arrow and the value below it.

When class I is used

The sign has class I (RA1) retroreflective sheeting: 70 cd/(lx·m²) for white and a 7-year service life. It is the economical choice for places without many light sources, such as local, minor and private roads or streets without strong lighting. Where there is street lighting, shop windows or advertising, SR 1848-2 requires prismatic class 2 or 3 sheeting, which stands out better against a lit background.

Where it goes, under SR 1848-1:2024

It goes at the start of a section closed to vehicles or combinations longer than the limit shown. It is also installed at the preceding junction, where an alternative route begins, with the P4 additional panel showing the distance to the restricted section.

Like all prohibition signs, it goes right after the junction before the restricted place, so drivers can go round without turning back, and it is repeated after every junction on the section. Exemptions for residents or certain vehicle categories are shown on the P34 and P18 additional panels.

Technical data

• 60 cm diameter disc (normal format, SR 1848-2): white with a red border, with the black outline of a lorry, a horizontal arrow and the value 10 m;
• 1 mm galvanised steel sheet, with pressed edges, no sharp edges;
• electrostatically painted with UV-resistant paint;
• class I retroreflective sheeting (RA1), resistant to UV and weathering, with a 7-year service life;
• weight: 3 kg;
• fixings included: 2 clamps for Ø48 mm posts and 4 bolts with nuts;
• CE marked; compliant with SR EN 12899-1:2007, SR 1848-1:2024, SR 1848-2:2011 and SR 1848-3:2011.

Mounting and size

Fixings for the post are included: 2 clamps for Ø48 mm posts and 4 bolts with nuts; clamps for Ø60 mm posts are available on request. The bottom edge of the sign goes 1.50–2.50 m above the road or kerb, and the edge nearest the road 0.50–2.0 m from the road platform. The sign must be visible from at least 50 m in built-up areas and 100 m outside them.

The post is ordered separately. For a fixed installation in a concrete foundation: the galvanised Ø48 mm post, 300 cm. For temporary use, with no foundation: the Ø48 mm tripod post, 120 cm. On concrete or paving, where you cannot dig: the Ø60 mm flange post, 300 cm, bolted down; for it, ask for the Ø60 mm clamps when you order.

The 60 cm diameter is the normal format in SR 1848-2, for county and local roads, streets and private roads open to public traffic. National roads call for the large Ø80 cm format and motorways for the very large Ø100 cm one; the standard forbids using a smaller format than the road category requires.