[folivier]

Don't know how true this but it was just posted by someone on Escapees forum, could be a reason why the routing isn't always what we would expect:

"The software providers for truck based routing are getting very gun shy because of scrutiny by people like Sen Chuck Shumer of NY who has threatened regulatory retaliation because of the number of trucks hitting bridges in NY state.
As a result the routing is getting more and more perverse as they make seemingly clear truck routes off limits and put you miles off course for no reason. I deal with it constantly in my 100K miles per year as owner operator , using 3 different systems."