4.12.1. The sign to diagram 632 (S3‑2‑5, see Figure 4‑35) is used to give effect to an order which prohibits overtaking. Such orders will be exceptional as situations where forward visibility makes overtaking hazardous can normally be dealt with by double white lines (see Chapter 5). “No overtaking” signs must not be used along the same length of road as double white lines. Situations where an order might be appropriate include: a) roads which are less than 6.1 m wide, thereby making double white lines impracticable (see Chapter 5), and b) roads along which the stopping restrictions imposed by double white lines would not be acceptable. 4.12.2. “No overtaking” signs might also be used at road works, where a temporary order will be required (see Chapter 8). Where a road is prone to ice or snowdrifts during most winters, an order can be made to prohibit overtaking when traffic signs are displayed. In this case the sign to diagram 632 should include a plate legend “Ice”, “Ice for” and a distance, “Snowdrifts” or “Snowdrifts” and a distance (see Chapter 4).