Having just been out west on a road trip in September of 2017, several large interstates had 80 MPH speed limits (I80 being one). I found the road conditions barely adequate for that speed. Granted it was in the Z3 with a lowered suspension, but the undulations of the road surface ate up every bit of suspension travel. What I found interesting was the prevailing traffic, while mostly light in density, well behaved and going the speed limit.
Now that is in contrast to the east coast, where interstate speed limits are between 55 and 70 MPH, while most traffic is easily travelling at 85+ MPH, with traffic density at NASCAR level in Turn 4 at Daytona under last-lap white flag condition.
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