I forget the Garmin model (275T???) which I gave to my Kids, but I could enter the size parameters for a commercial truck...Wt. per axle and number of axles, length, height, width and it would warn you if comm. trucks were not allowed on some streets. With all that protection, it would get mad if you didn't follow it's route. The worse was drive 5mi. to make a U-Turn instead of routing you to use the next X-over. You could disregard that warning ea. time tho. It was great in the NE where there's lots of low underpasses, of course it didn't help with low limbs or narrow than should street widths. You could go to Automobile mode and not be warned about all the truck parameters.
