4
ROAD NARROWS
4.1 General
4.1.1. Signs to diagrams 516 (S2‑2‑13, see
Figure 4-1
) or 517 (S2‑2‑14, see
Figure 4-2
)
should be used where a reduction in width on a single carriageway road presents a hazard.
Dual carriageway situations are dealt with in
4.1.6
. Signs will not normally be needed if the
narrowing does not result in the loss of a lane and involves a taper no more severe than
indicated in
Table 4-1
. However, signs should be provided regardless of the rate of taper where
a lane is lost on a single carriageway road or where the reduction in width is so great that the
centre line marking has to be omitted (see also
4.1.4
). The “REDUCE SPEED NOW” plate
(see
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