Two Bends Ahead (Double Bend) or Series of Bends Permanent UK Road Sign 

- Post Mountable with 2 fixing rails

- Class 2 R2/RA2 Reflective

- Available in 450mm, 600mm, 750mm, 900mm Tri

This sign is used to warn road users of a series of alternating sharp bends in the road. The two variations are very important to display to the road use which way the sharp turns start. These signs are often used with a series of supplementary plates including:

Dia 511 Reduce Speed Now

Dia 513.1 Adverse Camber

Dia 513.2 Maximum Speed Advised

Dia 526 Keep in Low Gear

Dia 570 For 00 yds

Dia 575 Oncoming Vehicles in Middle of Road

Diagram 512.3 has 2 variations for a harsh left turn and harsh right turn.

Specification: 

Material: R2/RA2 reflective overlay on aluminium composite backing

Fixing Method: 2 fixing rails for post mounting

Reflectivity: Class 2 R2/RA2

As per the UK Highways Traffic Sign Manual Chapter 4 - Warning Signs page: 20 The following advice is given:

3.1.7.  The sign to diagram 513 (S2‑2‑12, see Figure 3-5) should be used only where bends of similar severity follow in close proximity. The appropriate symbol must be used to suit the road layout; drivers are likely to be misled if the wrong symbol is used. The sign should be used only when the distance between the bends is less than that given in Table 3-1. See Appendix A for further guidance on the size and siting of warning signs. 3.1.8.  A plate with the legend “For” and a distance (see section 17) should be used under diagram 513 where a series of bends follow each other at distance intervals less than those referred to in the table. Where a double bend sign is used with a distance plate, bends or combinations of bends occurring within the distance shown on the plate should not be signed individually. However, they may be highlighted individually using diagram 515 (see 3.4.1 to 3.4.6).