I used to drive for a rail container hauler. I had to zip tie the throttle pedal linkage together one time on the side of the NYS Thruway on an old Mack R series. used to drive a White GMC anteater that had no speedometer, yet would run about 82 mph in top gear( I had a buddy run next to me one time to check). my solution was to never use top gear, since I didn't want a ticket. rust holes in the roof, rust holes in the floor, luckily for me, I never needed a tetanus shot. bald, mismatched tires, no ac, no mirror heat.