• It says 'Low Bridge' on the top. The bridge outline is marked in black and yellow (that alone should get a driver of a large vehicle to go "wait a second, is there a reason to think I might not fit?"). The bridge is also clearly marked with the maximum height, in both human and imperial measurements. That sign, placed just in front of the bridge, is extra anyway.

    And never mind all of that, someone driving a lorry like that should be very much aware that their vehicle might not fit in some places, so approaching any low-looking bridge they should be on the lookout for indications of the maximum height. I wouldn't blame them for driving up to the bridge and then having to awkwardly reverse out of it, but actually going for it, well...

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