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Old 11th June 2022, 07:47   #11
Mike Trident
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Glad I wasn't asked this question in my 20 odd years as a driving instructor lol

My guess would be, the red triangle sign indicates its a warning sign. The two black triangles are showing the maximum gap between two points, the top one obviously being the most important .
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Old 12th June 2022, 06:08   #12
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Quote:
Originally Posted by chris75 View Post
I don't think there is any particular significance , but the one above is indicating it is overhead clearance and that's the important bit . It wouldn't really matter if they left the bottom one off , but dimensions usually have an arrow or a triangle at each end . The guy who designed it had to put something on it and that's his version !
There is always significance. If there wasn't, the markings would be the same size. For instance, restricted width are signs all show equal sized triangles.
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Old 12th June 2022, 06:09   #13
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Quote:
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The bridge is either in a dip, crest of a hill or flat road.
Mmm. 1st time I've heard that idea.
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Old 12th June 2022, 06:10   #14
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Uneducated guess max height at centre of bridge
Nope. If the height varies, the lowest height is shown. An arched bridge shows where the high marked area is.
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Old 12th June 2022, 06:13   #15
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Quote:
Originally Posted by Mike Trident View Post
Glad I wasn't asked this question in my 20 odd years as a driving instructor lol

My guess would be, the red triangle sign indicates its a warning sign. The two black triangles are showing the maximum gap between two points, the top one obviously being the most important .
The prohibition signs also vary. It's puzzled me for at least 30 years.
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Old 12th June 2022, 07:44   #16
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Quote:
Originally Posted by polinsteve View Post
Mmm. 1st time I've heard that idea.

7.10 Care should be taken to ensure that vehicles of the maximum length permitted by the Construction and Use Regulations will be able to pass safely under the bridge. This is particularly important where the road dips or hogs sharply or is on a curving alignment under the bridge. Changes in gradient might affect the headroom, e.g. the effective clearance will be reduced for a long wheel base vehicle spanning a dip. Where the road passing under a structure is on a sag curve, the headroom should be measured along the carriageway over a 25 m chord.
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Old 12th June 2022, 11:37   #17
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You got me thinking and checking local signage around these parts.

Bridges where the bridge is flat and therefore uniform, the triangles are equal size. Therefore, headroom is the same across it's width.

Arched bridges have the bigger top triangle and so must indicate that this is the maximum headroom at the center of the bridge.
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