Today I went to test the spot I wanted to use for A-B-A testing. The turnaround at the top is an overpass where you can preview the uphill traffic, then a downhill onramp so it's easy to get up to raffic speed as you go over the top. Then there's an underpass and merge ramps going back uphill.
My speedometer is optimistic to the tune of 65 is really 55. I did an A-A test—65 at the top gave 80 at the bottom, then 55 at the top gave 75 at the bottom. This was on a weekday afternoon; I might go out some night and try from 25mph.
It's a nice circuit, but it's just too fast.
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