permitted is for contra—flow bus lanes; to extend this to cycles would risk undermining public respect for the sign, as to indicate that the road was not in fact one way only would invite contravention. Two "no motor vehicles" signs to diagram 619, without exception plates, are therefore used instead, as they do not prohibit pedal cycles. They should have a diameter of at least 750 mm, as drivers would be at risk if they were not seen. These signs may be supplemented by the NO ENTRY road marking to diagram 1046, in the position shown in figure 17-6; it must not encroach on the area where cyclists enter the contra—flow lane. The Directions do not prevent the NO ENTRY marking from being used on its own, i.e. it does not have to be used in conjunction with the sign to diagram 616. On the left hand side of the road, a sign to diagram 967 should be provided to indicate the cycle facility. Two sizes are prescribed; the smaller size should be adequate. The start of the contra—flow lane has a boundary line to diagram 1004 which should normally be continued for the whole length of the lane. However, where the advisory lane is not marked on the carriageway throughout its length (see para 17.24), the line to diagram 1004 should comprise at least five marks (see table 4-3 in Chapter 5). This is to ensure that vehicles emerging from the one—way street and two—way traffic turning right at the junction do not encroach on that part of the carriageway used by cyclists travelling in the opposite direction.
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Figure 17-6 Start of an advisory contra—flow cycle lane without a traffic island
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Figure 17-7 Cycle entry to a false one—way street
17.28 Where a side road joins the one—way street, signs should be provided in accordance with para 17.21. The advisory contra—flow lane should be marked with a boundary line to diagram 1004 on the carriageway of the major road through the junction, together with the pedal cycle road marking to diagram 1057.
FALSE ONE-WAY STREETS
17.29 These are two—way roads with entry from one end permitted for pedal cycles only. However, motor vehicles can make a U—turn and return to where they entered the road. This allows vehicles requiring access to premises to exit the road from either end.
17.30 The entry to the street, for cycles only, is shown in figure 17-7 and is similar to the start of a mandatory contra—flow lane as described in para 17.19. A "keep left" sign to diagram 610 should be provided on the island, facing oncoming traffic approaching the end of the street.
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