I do agree speed limits are too low on a lot of roads. Our loop here is 55 mph... it's 5 lanes wide in places and deserted as a ghost town at 8 PM on a weekday usually. Typical speed is 70 MPH when there is moderate traffic.
Last weekend coming back from TN through KY (saw a bunch of Z's cruising together) it seems the typical speed was 85 in a 70 mph zone.
IMO, it's not so much the speed that's a problem as it is the consistency. You can have a bunch of people going 80 mph on a straight road with 5 lanes, but throw a few Grandmas going 54 mph and you get a lot of crazy swerving and lane-changing and that's where you get much higher potential for accidents.
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