C1 Prohibition Sign – No Entry, Ø40 cm, Class I

C1 Prohibition Sign – No Entry, Ø40 cm, Class I

The C1, the red disc with the white bar, stops every vehicle from entering the road ahead. Traffic from the opposite direction is still allowed, which is why it is the sign at the exit end of one-way streets.

When class I is used

Class I (RA1) sheeting returns 70 cd/(lx·m²) for white to the driver and has a 7-year service life, enough on roads where headlights are the only light: local, minor and private roads or quiet streets. In areas with street lighting, shop windows, advertising and dense urban traffic, however, SR 1848-2 requires prismatic class 2 or 3 sheeting. The class II version is the C1_II (Ø80 cm).

Where it goes, under SR 1848-1:2024

It goes at the start of a section that no vehicle may enter, although traffic from the opposite direction is allowed, and at the far end of a one-way road. As needed, the P18 (exempted vehicle categories), P33 (road closed to public traffic), P34 (except residents) or P35 (except authorised vehicles) additional panels go under it.

Technical data

• 40 cm diameter disc (small format, SR 1848-2): red with a white horizontal bar;
• 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: 2 kg;
• fixings included: 2 clamps for Ø48 mm posts, with bolts and 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, with bolts and 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 40 cm diameter is the small format in SR 1848-2, meant for low-traffic minor roads and for short-term police signing at accident scenes. County and local roads, streets and private roads open to public traffic call for the normal Ø60 cm format: the C1. In car parks and private premises closed to public traffic the standard is not mandatory, so the small format is enough there.