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by m_mueller 4107 days ago
I'm quoting the data entries for the US that are either nation-wide or multi-state:

decreases

* US (22 states) (1992) 5 mph to 15 mph (8 km/h to 24 km/h) decreases No significant changes

increases

* US (1989) 55 mph to 65 mph (89 km/h to 105 km/h) Fatal crashes increased by 21%

* US (40 states) (1990) 55 mph to 65 mph (89 km/h to 105 km/h) Fatalities increased by 15% Decrease or no effect in 12 States

* US (40 states) (1994) 55 mph to 65 mph (89 km/h to 105 km/h) Statewide fatality rates decreased 3-5% (Significant in 14 of 40 states)

* US (22 states) (1997) 5 mph to 15 mph (8 km/h to 24 km/h) increase No significant changes

So no, I don't see the defining answer here. I'm not saying that the limits should be raised across the board, I'm also not saying that decreases aren't good - all I'm saying is that legal limits should be assessed from time to time (which they are), because of changes in society, technology and new data. Laws are not perfect.