SPECIAL CASES
12.13 Box markings are sometimes effective in combination with priority signs (diagrams 615 / 615.1 and 811 / 811.1) to break queues through an exceptionally narrow pinch point and enable an opposing flow to continue without unnecessary delay. The marking may be used for this purpose only if the carriageway width is less than 4.5 m at the narrowest point (regulation 29(2) and Part II of Schedule 19).
12.14 A different pattern of yellow box marking (diagram 1045) is used at Automatic Half Barrier level crossings (see paras 19.18 and 19.19). This may be appropriate at other forms of railway crossing if these are likely to become blocked by queuing traffic, but only with the agreement of the Railway Inspectorate. Further guidance on the use of box markings at level crossings can be found in paras 19.18 and 19.19, and at tramway crossings in paras 18.15 and 18.23.
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