The other thing to consider about speed limits is the huge advances in vehicle performance and safety equipment.
There's no reason a road designed & built in the 70s, to mostly accommodate vehicles from the 50s, 60s, and 70s, should still be limited to the same specs today, to accommodate vehicles mostly build in the 00s and on.
The most basic econobox, or even large truck can out brake & out maneuver the highest performing contemporary road cars when most of our main highways were built.
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