Tunnel Ahead Permanent UK Road Sign 

- Post Mountable with 2 fixing rails

- Class 2 R2/RA2 Reflective

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

The self-explanatory tunnel head sign indicates road users of an oncoming encloses tunnel. Diagram 529.1 has no variations. 

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: 37 The following advice is given:

7.2.1.  The sign shown in diagram 529.1 (S2‑2‑22, see Figure 7-4) is for use in advance of tunnels, a supplementary plate indicates the distance ahead to the tunnel. If the tunnel is controlled by wig‑wag signals, the sign should be supplemented by a plate to diagram 773 (S14‑2‑6, see Figure 20-4).