This suggests that a speed limit is beneficial if it's set near the engineering-recommended limit for a road, but becomes detrimental when set significantly bel

This suggests that a speed limit is beneficial if it's set near the engineering-recommended limit for a road, but becomes detrimental when set significantly below that level: https://www.sciencedaily.com/releases/2018/12/181212135021.htm https://www.sciencedaily.com/releases/2018/12/181212135021.h...