GT Slow, If you guy's are racing on the interstate,then go from a 40mph roll or even 50mph roll,that way the 18 wheeler's won't cram both of you in the ass when you stop traffic at 20mph.That is the problem with the slow roll's on the interstate! Go from 40 or 50 and call it a night!Remember,the speed limit is 55 so you won't be far from it!