In situations where size 3-5 turning heads would normally be permitted, a turning loop incorporating car parking spaces may instead be used.

These can form all or part of a footway, but should be adopted highway. The shaded areas in the accompanying diagrams are required for vehicle overhang and must be included as part of the highway. This is adequate for turning fire and rescue tenders and pantechnicons. In all other circumstances, a size 3 turning head will be sufficient. On type G roads of less than 20m in length, a size 5 turning head will be required. On type E, F and G roads that comprise side turnings from type D, E, F or G roads, and which are less than 20m in length excluding the turning head, a size 4 turning head may be used. Where very large vehicles are likely to frequent the system, it may be necessary to incorporate a size 1 turning bay. This may be contained within the first road junction off the cul-de-sac. On type D, E and F roads, the size of the turning head should be determined by the expected type and frequency of vehicles manoeuvring.Īny cul-de-sac system off a type A or higher category road is to provide a turning head of not less than size 2 dimensions. Entrances to premises or private drives should be located at the ends of turning heads, in order to discourage parking.