Figure 3-8 Diagram 515 (S2‑6‑3) Sharp deviation of route
3.4.2. Because the sign is often mounted in a position where it is especially vulnerable to being
struck by a vehicle of which the driver has lost control, supports that will yield easily under
impact should be considered (see also
3.4.9
).
3.4.3. Chevron signs should never be mounted one immediately above the other, as this
produces a confusing zig‑zag pattern. They must not be supplemented by diagonal stripes,
chequering or other unlawful background markings. Where greater conspicuity is required,
perhaps because of the background the sign is viewed against, a yellow backing board may be
used. The width of the yellow area should not be less than half the horizontal width of the white
chevron. Alternatively, a larger size sign to diagram 515 may be provided. Increasing the size
of the chevrons will result in the sign being seen earlier, provided that sufficient sight distance
is available. The improved conspicuity and legibility distance might encourage a greater speed
reduction.
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