Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/95

SIGNING PRINCIPLES The "weight restriction" sign to diagram 622.1A should be used where a weight restriction is required to prohibit goods vehicles, exceeding the maximum gross weight indicated, from entering a road. Where a restriction is imposed for structural reasons, a "WEAK BRIDGE" or "WEAK ROAD" sign to diagram 6262A should be erected. An "Except empty vehicles" bottom panel to diagram 627.1 may be added where appropriate. Use of either of these signs requires a traffic regulation order. It is usually necessary to place a sign on each 622.1A side of the carriageway, see direction 8.

"The ROAD CLOSED" sign variant of diagram 7010.1 should be used to warn traffic of a road closure ahead. The name of the road may be substituted for "ROAD Other permitted variants of this sign are listed in Table 4.3.

Cones and cylinders are used to delineate the traffic lane a driver should take past an obstruction, accident or road works. The portability of these devices is of particular advantage in emergencies or when they are used to delineate works which move progressively along a carriageway. Cones to diagram 7101.1, flat traffic delineators to diagram 7102 and cylinders to diagram 7103 are prescribed traffic signs. Traffic cones and cylinders shall conform to BS EN 134222:2004 "Vertical road signs. Portable deformable warning devices and delineators. Portable road traffic signs. Cones and cylinders" and must comply with regulation 56. Table 4.4 summarises the minimum and optional requirements for cones and cylinders for UK roads. 94