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A circle stating the maximum height that may pass.
Also known as: Low bridge sign, Maximum headroom sign
A height restriction is given in a prohibitory circle, in metres, feet and inches, or both. Britain requires imperial units on height signs by law, and bridge strikes by foreign vehicles reading only the metric figure are a documented and recurring problem.
Prohibits vehicles above a stated height from proceeding, given in a red-ringed circle.
Contexts: Road signage
Is signed in both imperial and metric units in Britain, where imperial units on height restrictions are a legal requirement rather than a courtesy.
Contexts: Road signage
Marks a restriction whose breach damages the structure as well as the vehicle, which is why bridge strikes are reportable events.
Contexts: Road signage
A circle with a red border containing a numeral between two inward-pointing arrowheads above and below.