[dagw]

Surely the cost of a decent satnav

Can you actually get a "decent satnav" (as in consistently better than Google Maps) any more?

[ninalanyon]

There are route planners specifically intended for the transport business that do include such information.

"Lorry Route tailors all routes to your vehicles, ensuring you never hit a bridge, or get stuck down a road too narrow. Keep your vehicles, drivers and environment safe."

For instance: https://www.lorryroute.com/#benefits