A52 Warning Sign – U-Turn Point Ahead, 70 cm, Class I

A52 Warning Sign – U-Turn Point Ahead, 70 cm, Class I

The A52 announces a place laid out for vehicles to turn back, by going round an island or another structure between the carriageways.

When class I is used

Class I means RA1 retroreflective sheeting, with 70 cd/(lx·m²) for white and a 7-year service life. It suits places where the sign does not compete with other lights: roads and streets without strong lighting, local, minor and private roads. In areas with many light sources, such as streets with public lighting, shop windows and advertising, SR 1848-2 requires prismatic class 2 or 3 sheeting, because a class I sign gets lost against the background there.

Where it goes, under SR 1848-1:2024

It goes on the approach to a place where turning back is allowed by going round an obstacle between the two directions of traffic: an island or another structure built for it.

How far before the hazard: in a built-up area, 50 m at most; outside it, between 100 and 250 m; on a motorway or expressway, between 500 and 1,000 m, with the P4 panel underneath. When site conditions call for a longer distance, the P4 is used anywhere.

Technical data

• equilateral triangle with a 70 cm side (normal format, SR 1848-2), 60 mm red border, white background, black symbol;
• 1 mm galvanised steel sheet, with rounded corners and 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 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

The sign comes with 2 clamps for Ø48 mm posts and 4 bolts with nuts. Clamps for Ø60 mm posts are available on request. It goes on the right-hand side of the road, with its bottom edge 1.50–2.50 m up and its inner edge 0.50–2.0 m from the platform; on roads with two or more lanes each way, repeating it on the left is recommended. No more than three signs go on the same post.

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 70 cm triangle is the normal format in SR 1848-2, meant for county and local roads, streets and private roads open to public traffic. National roads call for large 90 cm signs, and motorways for very large 120 cm ones.