Tim Steller’s excellent (dare I say, stellar?) piece in the Daily Star: Enforcement drops, crashes proliferate, pedestrians die exposes the inexplicable sharp decline in traffic enforcement in the City of Tuscon by the Tuscon PD. Continue reading Enforcement drops, crashes proliferate, people die
It’s been noted that the number of reported Bike-MV crashes reported by police in Arizona have seen a mysterious sharp decrease; even as the number of MV crashes in general has risen. In round numbers through the 2009-2016 period, Bike-MV crashes have fallen by about a third, while crashes overall have increased by 20%. This time period covers the economic downturn following the Financial Crisis of 2008 and subsequent recovery. That trend has been used to explain the MV crash rate; but it doesn’t seem to have anything to do with Bike-MV rates; which would logically rise with more traffic and more (MV) traffic crashes.
Fewer crashes would be a good thing of course, but it feel like there’s something else going here. Also, the number of fatalities, while statistically small, remained relatively flat but above their longer-term trend of 24 (rolling 10 yr average 2007-2016; refer to internal spreadsheet \crashReports\asdm\AZstats.xls)
Chandler, Flagstaff, Gilbert, Glendale, Mesa
Number of Arizona bike-MV crashes 2009-2016
The graphical crash map has been updated and now contains 2009-2016 for both MV-bike and MV-ped crashes.
The Fatality Grid has been reconciled and contains some specifics on every bicyclist fatality in Arizona from 2009-2016
With the sharp increase in traffic fatalities in 2015 (35,092 a 7.2% increase) — this is getting some extra attention, e.g. the Fastlane blog said on Aug 29, 2016: “2015 Traffic Fatalities Data Has Just Been Released: A Call to Action to Download and Analyze”. The big data news here is that PBCAT data has reappeared, and the 2014 and 2015 datasets released today both have a PBtable. PBCAT data is important because it give much more granular information about bicyclist (and pedestrian) fatalities. Continue reading 2014 and 2015 Arizona Bicyclist Fatalities
The City of Flagstaff has put together crash data DRAFT Working Paper 4 Pedestrian and bicycle crash data. This report released in Oct 2015 geographically covers Flagstaff Metropolitan Planning Organization (FMPO) region — so the city of Flagstaff and surrounding area — for the 10-year period from 2005 to 2014. It is well documented and uses the ADOT Safety Data Mart exclusively. As such, it doesn’t add any additional data of the sort that was added by the City of Phoenix’s collision summary. E.g. The City of Phoenix summary breaks down the cyclist’s position (accurately, by reading each crash report narrative) to reveal 70% of cyclists involving in collisions were on the sidewalk just prior to the collision (either at a crosswalk, or driveway). Continue reading Flagstaff Bike / Ped Crash Report
There was a study published in 2007 which took FARS (for traffic fatalities) and GES (for injuries) data, and combined with NHTS (National Household Transp Survey. 2001) data to try to quantify relative risk of fatality/injury by travel mode per trip. Full text and full .pdf are both available free online: Continue reading Crash Injury Rates by Mode of Travel
Rear-end crashes are, by far, the most common motor vehicle crash. Looking at all MV-MV (that is, motor vehicle crashes excluding single-vehicle crashes), a whopping 47% were classified as rear-end, using 2012 Arizona data. That’s almost 50,000 rear-end collisions a year, just in Arizona!
The explanations generally run to generic excuses: the driver of the striking vehicle was driving too fast for conditions, or “distraction” — which are more-or-less true by definition. Continue reading 2 percent of rear-end crashes involve a slowly-moving lead vehicle
A note about data sources
- FARS. As of this writing the 2013 final is available, and 2014 is preliminary
- Arizona Crash Facts; published yearly by ADOT in June of the following year
- ADOT collision database sometimes called ASDM (I’ll refer to it as that, below); released yearly in June of the following year
- News / Media reports; obviously this is very incomplete and hit-and-miss
Data from all these sources is located centrally on this google docs spreadsheet. which covers each bicyclist fatality occurring from 2009 onward.
Normally these are all in agreement, however there are multiple inconsistencies in both 2013 and 2014 that I cannot resolve. Continue reading Missing 2013 and 2014 Fatalities
[mid/late 2016 NSC estimates for fatalities are up big-time over 2015]
As a follow on to last week’s story about how Arizona 2015 traffic fatalities are up by at least 15% …
Preliminary data prepared by the NSC shows traffic fatalities nationally are expected to be up 10% (though an AP story says 8%) . And FHWA preliminary data shows total VMT (Vehicle Miles Traveled) will increase to 3.1T miles, compared with 3T in 2014; (so perhaps a 3.5% increase). Continue reading Total VMT and fatalities are up