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4.—(1) In addition to the requirement conveyed by the sign shown in diagram 610 of the 1994 Regulations in accordance with those Regulations, a keep right sign shall convey to vehicular traffic a warning of a temporary obstruction.
(2) Section 36 of the Road Traffic Act 1988(1) shall apply to the keep right sign.
5. In addition to indicating the edge of a route for vehicular traffic through or past a temporary obstruction, in accordance with the 1994 Regulations, a traffic cone and a flat traffic delineator shall each convey to such traffic on a road a warning of an obstruction in the road.
6. A road vehicle sign shall convey to vehicular traffic using a road a warning of a temporary obstruction in the road caused by a stationary vehicle.
7. A traffic pyramid, a traffic triangle and a warning lamp shall each convey to vehicular traffic using a road a warning of a temporary obstruction in the road, other than an obstruction caused by the carrying out of works.