Welcome to the 11 foot 8 bridge. Turns out the reason is a sewer pipe under the road, and a train bridge above.

That's... That's more clearance than a lot of bridges have. More than enough for basically any bus including many if not most double deckers or standard size freight.

What engineer would use 'ft's? *ducks*

Considering most large trucks are 13ft6in or lower it's also not a legit reason for exclusion

That's... there's a 3x3 meter train crossing around here.