> If you raise the limits just because drivers are going faster, then the drivers will just increase their speeds until again
No. Most people who drive significantly faster than the limit are disregarding the limit and are driving at the speed they feel to be safe. They aren't considering the limit and blindly choosing to drive X over it, such that they'd drive X even faster even if the posted limit were raised by X.
If a long flat and straight country road in good condition has a posted limit of 30 and most people instead do 60 (this is common in many parts of the country), they wouldn't start doing 120 if the limit were raised to 60 because "do double the posted limit" was not their objective in the first place. Their objective was "drive at the speed which is safe for this road" and the condition of the road didn't change, so that speed doesn't change.
(The reason I know this to be true is because the proportion of drivers who speed on any given road varies wildly with the road. On some roads, 95% do substantially faster than the limit while on other roads that ratio is flipped around the other way. This demonstrates that speeds are being chosen by the condition and nature of the road, not derived in some way from the posted limits.)
> The reason I know this to be true is because the proportion of drivers who speed on any given road varies wildly with the road.
Another way to arrive at this conclusion is that if the speed limit is both 65 for trucks and cars its trivially not the limit of how fast one can safely drive. And as expected, you see trucks going 65 while cars speed around them at 70+.
And also the inability for people to use the pedal and the steering wheel at the same time resulting in large 15+ mph speed drops around a highly visible curve.
No. Most people who drive significantly faster than the limit are disregarding the limit and are driving at the speed they feel to be safe. They aren't considering the limit and blindly choosing to drive X over it, such that they'd drive X even faster even if the posted limit were raised by X.
If a long flat and straight country road in good condition has a posted limit of 30 and most people instead do 60 (this is common in many parts of the country), they wouldn't start doing 120 if the limit were raised to 60 because "do double the posted limit" was not their objective in the first place. Their objective was "drive at the speed which is safe for this road" and the condition of the road didn't change, so that speed doesn't change.
(The reason I know this to be true is because the proportion of drivers who speed on any given road varies wildly with the road. On some roads, 95% do substantially faster than the limit while on other roads that ratio is flipped around the other way. This demonstrates that speeds are being chosen by the condition and nature of the road, not derived in some way from the posted limits.)