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Depends on the rate of deceleration, which depends on the mass of the vehicle and the amount of friction of the brakes/tires. A vehicle decelerating at the rate of .5g requires more than 1700 feet of road if they are braking from 160 MPH. I don't know the average rate of deceleration for these vehicles, so it's difficult to say.
You may want to mark off (discreetly) a section of long highway to a length of 5000' and see what is the fastest you can get before needing to slam on the brakes to come to rest before 5000'. You also should take into consideration that not all brakes are going to work the same, so use the worst case vehicle deceleration.
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