Using information from the American Department of Transportation, its Federal Highway Administration, and something called the Regional Integrated Transportation Information System, they monitored not only the number of crashes and the speed at which they occurred, but also the traffic volumes at the time of the collision, as well as the changes in travel times the revised speed limits engendered.
This randomness persisted regardless of what state the route was in — in other words, none of those “freaky Californians always drive stoned, don’t they?” excuses — and what type of highway was being tested . For instance, in two of the three interstates that raised limits from 65 mph to 70 mph crashes increased, but in the other, the frequency went down. But, says the AAA, in all three cases, the differences in the number of crashes was “not statistically significant.
In fact, as I said off the top, the “only consistent results” the study found was the likelihood of drivers being issued speed-limit violations: “After raising posted speed limits, vehicle speeds were less likely to exceed the speed limits, while they were more likely to exceed the speed limits after lowering speed limits.
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