downhill until they meet, using a road marking to diagram 1013.1 version B (see figure 5-7). The taper in the version B marking (see figure 5-1) should not be sharper than 1 in 50.
LAYOUT AT CRESTS
5.34 Where there are climbing lanes on both sides of the hill and the road has been widened on the crest to 13.2 m, as indicated in TD 9 / 93 (Amendment No.1) in Volume 6 of the Design Manual for Roads and Bridges (see para 1.4) then:
(i) if the length of 13.2 m wide carriageway (including any hatched area) between the tapers is 500 m or more, a conventional layout should be used between the tapers,
(ii) if the length of 13.2 m wide carriageway between the tapers is less than 500 m, the climbing lanes should overlap as shown in figure 5-8. In this case the distance between the tapers (i.e. the length of 13.2 m carriageway including hatching) should not be less than 200 m.
5.35 If the carriageway over the crest remains unchanged in width at 10 m, the marking layout shown in figure 5-9 should be adopted.
LEVEL CROSSINGS
5.36 Double white lines are used at some level crossings even when the conditions do not meet the visibility criteria in table 5-2 (see paras 19.9 to 19.17 for details). Markings should be installed at level crossings only after consultation with HM Railway Inspectorate.
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