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629.2 Mandatory height restriction
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629.2A Mandatory height restriction (metric and imperial units)
These signs may be used with diagram 530.2.
The height may be varied (see Appendix C)
7.18 Signs to diagram 629.2 or 629.2A may be used, but the latter, which shows both imperial and metric dimensions, is preferred. The signs should be mounted on the bridge, as a driver seeing a bridge with no height limit indicated might well assume the headroom to be at least 16'-6". They may also be placed at the roadside in advance of the bridge in accordance with direction 8 (in most cases a sign being required on each side of the road), but as it is an offence for drivers of overheight vehicles to pass these signs, they should not be placed where they would prevent legitimately-required access to premises or side roads. Even when diversion signing has been provided, it is still necessary to give proper advance warning of the height restriction. Signs to diagram 530 or 530A are not appropriate, as they give no indication of the prohibition. Diagram 818.3 (or diagram 818.4 if it is considered necessary to include the diversion route) should be used; it will sometimes be possible to indicate an escape route for drivers who have missed the diversion signs by siting this sign in advance of the last diversion or turning point before the bridge. If it is much further from the bridge than the usual warning distance indicated in [[Page:UK Traffic Signs Manual - Chapter 4 - Warning Signs. 2013.pdf/A|Appendix A, another sign to diagram 818.3 or 818.4 may be required at the appropriate place. Diagram 818.3 or 818.4 may also be used to indicate a restriction in a side road by including an arrow on the sign (the legend “ahead” must not be used with the arrow). The signing on the approach to a non-arch bridge is shown in figure 7-2.
7.19 Although warning signs to diagram 530 or 530A may be mounted on non-arch bridges as an alternative to mandatory signs, this practice is not recommended.
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530.2 Reduced headroom at a hazard
May be used only in combination with diagram 530, 629.2 or 629.2A
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