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You don't need to have the road to yourself to do high-speed coastdown testing. In a 65mph zone, you can coast down from 74mph to 60mph with a small break in traffic. In Buffalo, there are expressways where you could do that 20 hours a day.
You'll want to do runs in both directions, to account for gravity. As for Crr, ideally you'd do low-speed testing on the same pavement, so you may have to test for Crr on side roads and just hope the numbers are similar.
Sure, passing cars, gravity, etc will interfere. But you can deal with noisy data by having a very large number of samples.
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