3m?
Paris has a road tunnel with a 2m clearance. Some of us here would have our heads grazing the top if we had to walk through it.
> Vehicles will be limited by regulation and an overhead bar on entry to 2m (6.6ft, 79 inches). The space to the ceiling itself will provide 57cm (22 inches) for signage and other overhead gear.
I think the Montague Street Bridge and the Durham railway bridge claim so many trucks because they're just high enough (3m and 3.56m respectively) to trick inexperienced high vehicle drivers.
The 2m one would be obvious you can't make it through.