The "10' wide" fire engine there supposedly conforms to the AASHTO BUS-14 standard... which means 2.6m wide. (This is the widest type of vehicle in the list.) 2

The "10' wide" fire engine there supposedly conforms to the AASHTO BUS-14 standard... which means 2.6m wide. (This is the widest type of vehicle in the list.) 2.6m = 102"; 102" = 8.5'. Go figure, as they say. Please allow me, not that you have the option or anything, to link to a previous comment of mine, which is probably appropriate: https://news.ycombinator.com/item?id=12472990 https://news.ycombinator.com/item?id=12472990 (Maybe 10' includes the wing mirrors? 1.5' = 45cm. 22.5cm per side. Not unreasonable for lorry-size wing mirrors.)