Detroit fact of the day

by on July 3, 2008 at 3:37 pm in Data Source | Permalink

Among cities with more than 500,000 residents, Detroit has the
safest drivers, with accident rates that are 20 percent below the
national average.

For cities with more than 1 million residents, Phoenix has the
safest big-city commuters, with accident rates about equal to the
national average.

Here is much more, Philadelphia is a disaster and L.A. isn’t so safe either.  I wonder to what extent these rankings simply proxy for traffic density.  Here are some charts.  Overall Sioux Falls, Tucson, and El Paso seem to be relatively safe cities for driving.

Steve Horwitz July 3, 2008 at 3:56 pm

As a native Detroiter who frequently returns home (I was just there a few days ago), I should note that this stat is even more impressive given that Detroiters drive VERY fast. Even on urban freeways, you better be doing 70 or 75 or you’re going to get passed left and right.

Anonymous July 3, 2008 at 4:16 pm

Data on metropolitan areas would be more valuable than data on cities, as is almost always the case.

Colin July 3, 2008 at 4:32 pm

Based on our frustrating experience of getting timely crime data out of Detroit, I’d question the reporting. It might be a good place to have an accident go unreported.

Sam Penrose July 3, 2008 at 4:42 pm

The most dangerous roads, I recall reading somewhere, are “local arteries”: streets with lots of intersections that carry lots of through traffic at 35+ Mph. These streets are distributed very unevenly; certainly Philadelphia is dominated by them and LA, famous for its freeways, may have a lot too.

Mr. Econotarian July 3, 2008 at 6:23 pm

LA Freeways? I almost died on Sunday when some nut half-ran a red light on San Vincente at Wilshire. Once he realized he was going to hit the car next to me he slammed on his brakes, the car next to me swerved into my lane, I swerved into the (empty) oncoming lane.

The other problem in LA is that if you accidently cut someone off, you might get shot.

Dave Barnes July 3, 2008 at 6:47 pm

Accident rates and safety are NOT the same thing.

For example, our car was recently rear-ended here in Denver. At 5 mph. An accident? Yes. A safety risk? Emphatically not.

TomM July 3, 2008 at 7:07 pm

JohnZ, I think the possibility that women are more likely to have kids in the car would cause them to have more distractions. Try having two screaming, fighting or otherwise children in the back seat of your car and I’m willing to bet you become frustrated, angry, or any other number of emotions that could be very distracting.

my $.02.

tom.a July 3, 2008 at 10:02 pm

Phoenix factors are probably low population density, wide roads, straight grid-patterned layout and good year round weather conditions.

liberalarts July 4, 2008 at 8:32 am

CD – Philadelphia may have a high fraud rate, but it also has the highest (or one of the highest) rates of uninsured motorists too. I doubt that accidents between two uninsured motorists get reported often: why bother?

liberalarts July 4, 2008 at 8:32 am

CD – Philadelphia may have a high fraud rate, but it also has the highest (or one of the highest) rates of uninsured motorists too. I doubt that accidents between two uninsured motorists get reported often: why bother?

bottomofthe9th July 4, 2008 at 8:59 am

Tyler’s point about congestion is spot on. Detroit’s economy is awful, and as a result no one is on the road. My parents live there, and when they visit me in Houston they always are blown away by how many people are on the freeways, saying that our weekend traffic is more dense than some Detroit freeways in rush hour.

Not to mention that with so many folks working for the auto companies, in the Detroit area, a given household owns more cars than one with comparable wealth in another metro, because the cars are cheaper with employee discounts. And “number of cars” (rather than the more appropriate lane-miles) is the denominator, further biasing the results for Southeast Michigan (note the various other Detroit-area cities on the list, too.

Rex Rhino July 4, 2008 at 11:38 am

bottomofthe9th, Steve Horwitz:

While there may be statistical anomalies that makes Detroit look better than it really is, Detroit drivers really are much better than drivers in most other places.

My theory is this:

1. In Michigan, many people take drivers education as a part of their high school education. I took drivers education and auto safety in high school, for an entire semester, for a real grade. My high school at the time actually had a dedicated auto-track to drive on, we did obstacle courses through cones and barriers, etc.

2. People don’t engage in as much aggressive driving, because they know better than to mess with random strangers.

3. Less youth street racing.

Those of us in Michigan have some questions about that study. Notably, how are they counting those crashes? If the insurance company is looking at insurance claims, that would be an issue. There are parts of the city where the majority of vehicles are reportedly uninsured [citation needed]. If they use police reports, would you call the police if you were an uninsured driver in a crash? I reviewed crash forms from the Detroit intersection with the most crashes, and quite a few fender benders were hit and runs where the “running” driver stopped, made sure no one was injured, then left before the police came (saying they had no insurance/license/whatever). Few of those minor crashes where two uninsured parties collide are likely to be reported.

Zubon: White Suburbanite Urban myth. Poor people, who would be the type of people who don’t have insurance, are also the type of people who are also of the demographic (junky cars, dark skin) that cops especially like to pull over and harass. A black man with a junky car is absolutely the last person in America who can get away with driving around with no insurance.

Paul N July 4, 2008 at 2:47 pm

Both traffic density and type/date of road construction are important, I’m sure that once you remove these two factors there’s no longer any meaning to the inter-city data.

I’m surprised how high the overall frequencies are! If I count the family I grew up in, where I have complete data, it’s 5 accidents in 107 years of driving, ages 15-58 (and only 2 in 68 years if you leave out my mom).

mik July 5, 2008 at 3:31 am

Rex Rhino says:

Black cops are more likely to pull over black motorists.

Reference?

spencer July 5, 2008 at 8:50 am

How can Phoenix have both AVERAGE accident rates and be the SAFEST city?

Please explain how these two apparently conflicting claims can be true.

Nate July 5, 2008 at 5:20 pm

It would be useful be able to separate the contributing factors to these statistics. How much of the observed differences are attributed to differences of road architecture, versus variances in local driving culture, versus different local driving laws, versus reporting methodologies.

John Dewey July 6, 2008 at 6:30 am

Allstate claims that a study based on its own policyholders gives a realistic snapshot of what’s happening on America’s roadways. Individual states have different laws governing insurability and uninsured motorist coverage. Is it possible, then, that Allstate’s data represents different levels of riskiness from state to state? If Allstate can cancel the insurance of a DUI in one state but only raise the premium of such a driver in another, then the riskiness of Allstate’s insured population should be higher in the latter state.

One point to note is that Massachusetts cities are excluded because Allstate does not offer insurance products in that state.

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