Quote:
Originally Posted by GP_Matt
A lot of companies are moving towards vehicle tracking systems that alert the driver and employer if they exceed the speed limit. This means that the drivers have to stick to the official posted speed limit. I am all for raising the speed limit to 120 and making it clear that they will ticket for 130 and up.
The key part of the article is that they had the engineers look at each road and evaluate its design speed. They left it out of the hands of politicians and allowed the engineers to report on the safe speed of travel. (In typical engineering fashion, I am sure they base their math on a car with crappy brakes and bald tires.)
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One thing they also do is look at differential speed. Causing more overtaking maneuvers to happen adds a lot of risk in highway driving. So one of the things you do is set the speed limit at a number which produces the lowest variance.
Design speed is based on something similar to a full size van. Most roads are designed at 120 and signed politically at 100.