More crashes, fewer tickets: AAA tracks the impact of raising speed limits
of several speed limit adjustment projects nationwide. The study included cases of speed limits being raised and lowered, and looked at projects based on roadways in four major categories — interstate highways, principal arteries, minor arteries and collectors — from all over the USA. While your local project may not have made the list, chances are there's something comparable in the mix. Let's take a look at some of the key takeaways.
Moving away from interstates, the data get even more murky. Fatalities increased or decreased by only low-single-digit amounts on surface streets. In two cases, they increased. In two others, they went down. The remaining two showed no records for either the study period or control period. AAA also provided data for accidents resulting in non-fatal injuries or property damage only.
This also held true on arterial roads. A 5 mph increase on TX-289 resulted in an 85th percentile speed increase of just 2.1 mph. An identical change on Victory and Obama Boulevards in California resulted in an 85th percentile speed increase of 2.4 and 1.6 mph, respectively. In all three cases, AAA saw compelling evidence of reduced travel times.
And what about cases where speed limits were reduced? AAA wasn't able to study any interstates with reduced speed limits during the window of this study, but six arterial and collector roads were examined, five of which had their limits reduced by 5 mph. The sixth — a stretch of Southwest Capitol Highway in Oregon — was reduced by 10 mph.
But before you grab your pitchfork and go after City Hall for dragging down your local speed limit, would you care to guess how many of those changes caused an increase in travel times? Yeah, the number's zero. Driving 25 mph in the city might suck, but as it turns out, it's not actually holding anybody back. Total traffic volume was unaffected, AAA says. Of the conclusions suggested by AAA's study, the most compelling was its analysis ofinfractions.
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