Pick a speed and stick with it

There's two ways, find someone that can get into the trucks computer to disable it, or unplug the radar. It's usually embedded in the bumper, but unplugging it will disable a lot of "features" like the braking assistance that oh so often decides the shadow of a bridge is something your going to hit, it also disables adaptive cruise control amd a couple other things I can't remember off the top of my head. However, take this measure with caution, depending on your company they may take action against you for doing this without a clear malfunction, because most modern trucks they can tell its been unplugged through your eld because it will throw codes amd give you a check engine light. Some carriers will not approve. Some won't like it but will let it slide, and some simply could not care less as long as you aren't damaging the truck. Most mega carriers will be a hell no to it, smaller ones I would ask your safety or driver liason or if you have maintenance personnel ask them because they will likely be the first to see your engine codes and report.