Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/92

 The “no overtaking” sign to diagram 632 must not be used without an order. Its use at road works would normally be in situations where existing double white lines have been obliterated and cannot be replaced quickly; see paragraph D4.6.4.

The “Flood” sign variant to diagram 554 is used to give warning of flood conditions on a road along which travel is hazardous or even impossible. Except when used as an emergency measure for short-duration standing water, it should always be followed, beyond the flooded length of road, by a "Try your brakes" sign to diagram 554.1. Depth gauges to diagram 826 or 826.1 should always be placed at sites liable to flooding and the "Flood" sign erected when conditions become dangerous; see also Chapter 4. The use of the dual unit sign to diagram 826.1 is strongly recommended. In the event of a complete road closure the “Flood” sign should be supplementedby the "ROAD CLOSED" sign variant to diagram 7010.1, if necessary preceded by "ROAD AHEAD CLOSED" sign variant to diagram 7010.1. The former is appropriate at the point where the flooding begins and the latter, accompanied by alternative route signs, at the preceding junction.

The "risk of ice" signs to diagram 554.2 and 554.3 together warn of situations where ice conditions are known to be present and a particular hazard; see also Chapter 4. Warning of fog is given by the matrix signal to diagram 6011, warning of ice can also be given by 6011.1.

The "slippery road" sign to diagram 557 warns of the hazard due to slippery road surfaces. The sign is intended to be used only until the problem can be rectified; see Chapter 4 for further details. It should be used with a distance plate to diagram 570. 91