Directions permit supplementary plates to diagram 954 (Except buses) and 954.2 (Except local buses) to be used with diagram 616, this is no longer recommended, as the primary use of the "no entry" sign is to protect the end of a one-way road, where it would be hazardous and endanger the safety of road users should the sign be ignored. No other plates are prescribed or permitted for use with the "no entry" sign. Exception plates for cycles (diagrams 954.3 and 954.4) are prohibited by direction 21(2) from being used with the "no entry" sign. Where cyclists are to be admitted, signs to diagram 953 or 955 should be used in place of the "no entry" sign, or a cycle by-pass constructed. Where access to a two-way street is restricted to a particular class of vehicle or for a specific purpose (e.g. loading), a sign to diagram 617 (no vehicles) or 619 (no motor vehicles) should be used with an appropriate exception plate. For further details on contra-flow bus lanes and contra-flow cycle facilities see sections 15 and 17 respectively.
4.43 Where a traffic bollard is situated at the exit from a one-way road, it may be fitted with a 270 or 300 mm diameter "no entry" sign to stop vehicles entering from the opposite direction. This sign should be used only in addition to, and not in substitution for, the larger signs. The "no entry" symbol may also be incorporated into map-type advance direction signs (see para 4.7).
NO ENTRY SIGNS (OTHER THAN ONE-WAY ROADS)
4.44 Exceptionally, "no entry" signs may be used without an order; but only with the written approval of the Secretary of State (direction 7(3)). Such approval will be given only where it is proposed to use the sign for safety reasons in circumstances where this would not prohibit an otherwise permitted movement. This procedure must not be used to prohibit completely a particular turning manoeuvre at a junction or to prevent access at the end of a segregated lay-by on a single carriageway road. If this is necessary, a traffic regulation order must be made. Circumstances where an order is not required might include guiding drivers at channelising traffic islands, e.g. when approaching a roundabout or when turning right into a side road.
4.45 "No entry" signs might also be used to reduce the risk of traffic entering the wrong carriageway of a dual carriageway road or travelling in the wrong direction along a slip road. They should not, however, be provided as a matter of course, but only where there is a genuine risk of confusion. "No entry" signs are unlikely to be justified where an acceleration lane is provided for traffic joining a dual carriageway road. Superfluous signing is not only unnecessary, it is unsightly and can distract or confuse drivers on the opposite carriageway.
4.46 At a junction with a dual carriageway where there is no gap in the central reservation (i.e. all traffic from the side road turns left), diagram 606 with a plate to diagram 608 should be sufficient without the need for "no entry" signs (see figure 4-2 and para 4.3). Where there is a gap in the central reservation and traffic can turn right into the dual carriageway from the side road, "no entry" signs might be beneficial to deter drivers from turning into the wrong carriageway. Where the junction is controlled by traffic signals, the signs would usually not be necessary.
4.47 The NO ENTRY road marking to diagram 1046 (see Chapter 5, paras 22.29 to 22.32) may be used in the situations described above, with or without associated upright "no entry" signs, and will also require written approval.
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614 No U-turns
May be used with diagram 570 or 645
NO U-TURNS
4.48 The "no U-turn" sign to diagram 614 is used to give effect to an order which may apply to a junction or a length of road. At signal-controlled junctions, 300 mm diameter signs should be mounted either alongside and to the right of, or immediately below the green aspect of the duplicate primary and the secondary signals. At junctions not controlled by signals, the sign should be mounted on the central
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