> Personally, I'd rather they clamped down harder on tailgating, poor lane discipline and uninsured drivers than on motorway speed limits.
There's some interesting facts (?) that I've learned on the topic of traffic safety over time: certainly the speed one has is directly proportional to how bad an accident will be should a crash (née "accident") occur because of the kinetic energy involved.†
However, the speed differential between different vehicles also has a correlation to the accident rate because some folks are going 'too fast' but others are going 'too slow'. I've heard this used as an argument for variable/dynamic speed limits which are changed on factors such as road conditions and visibility.
† Numberphile has an interesting video on the topic: if a blue car is doing 70 (units/hour) and manages to just stop before an obstacle, what would happen to an identical model/mass red car going 100? Even though the red car was going only 30% faster, at the point that the blue car managed to (just) stop, the red car would be going 70.
The energy scrubbed from a starting speed of 70 is 70^2, so 4900; but going at 100 you have 10'000 energy (100^2): so if both cars managed to scrub ~5000 worth of energy, the blue car stopped, but the red car still at 5000 worth of energy left—i.e., 70 units/hour of speed.‡
‡ If you had the same blue/red cars going 55 and 100, while the red car would been going 'only' twice as fast, it would have had three times the kinetic energy because of 55^2 versus 100^2.
There's some interesting facts (?) that I've learned on the topic of traffic safety over time: certainly the speed one has is directly proportional to how bad an accident will be should a crash (née "accident") occur because of the kinetic energy involved.†
However, the speed differential between different vehicles also has a correlation to the accident rate because some folks are going 'too fast' but others are going 'too slow'. I've heard this used as an argument for variable/dynamic speed limits which are changed on factors such as road conditions and visibility.
* https://en.wikipedia.org/wiki/Speed_limit#Variable_speed_lim...
* https://www.sciencedirect.com/science/article/abs/pii/S00014...
† Numberphile has an interesting video on the topic: if a blue car is doing 70 (units/hour) and manages to just stop before an obstacle, what would happen to an identical model/mass red car going 100? Even though the red car was going only 30% faster, at the point that the blue car managed to (just) stop, the red car would be going 70.
The energy scrubbed from a starting speed of 70 is 70^2, so 4900; but going at 100 you have 10'000 energy (100^2): so if both cars managed to scrub ~5000 worth of energy, the blue car stopped, but the red car still at 5000 worth of energy left—i.e., 70 units/hour of speed.‡
* https://kottke.org/18/02/why-speeding-is-so-dangerous
‡ If you had the same blue/red cars going 55 and 100, while the red car would been going 'only' twice as fast, it would have had three times the kinetic energy because of 55^2 versus 100^2.