Preventing Bicycle Fatalities at US-36 and Violet

Ghost Bike at Violet and US-36 in North Boulder

Two bicyclists have been killed at the intersection of US-36 and Violet Avenue since 2009. The most recent was TJ Doherty, on July 24th, 2012. Both cyclists were headed southeast on US-36, and were hit by cars traveling northwest, making left turns onto Violet. In this area US-36 is just outside of Boulder’s city limits, in the county, but it’s the Colorado Dept. of Transportation (CDOT) that’s responsible for it. Looking at the aerial view below we can explore why this intersection might be particularly dangerous for cyclists.

Northwest bound vehicles on US-36 have a dedicated left turn lane, and no obligation to stop before making their turn. The angle that Violet Ave. makes with the highway is quite oblique, meaning that it can be taken at high speed, and because US-36 has a speed limit of 55 mph in this area, cars often will take it at high speed if they don’t see any oncoming traffic.

From a southeast bound bicycle’s point of view, there’s no obviously correct place to be on the road, if they’re planning to proceed through the intersection. The shoulder on the west side of the road narrows to a few inches, and it’s to the right of a right-turn-only lane. If you ride all the way to the right, you risk a vehicle turning in front of you onto Violet. Your intent to continue through the intersection is also unclear to oncoming traffic. Most cyclists instead take a position that’s well within the right turn lane, to prevent right-turning vehicles from passing them and immediately turning right in front of them. However, this lane position still leaves their intent ambiguous to oncoming traffic. Alternatively, you might choose to straddle the line separating the through travel lane and the right turn lane. This makes the bike relatively visible, and more clearly conveys the intent to continue through the intersection, at the expense of potentially sandwiching the cyclist between right turning vehicles and very fast moving through traffic. If the cyclist instead chooses to behave exactly like a motor vehicle, moving into the through lane of traffic, the very large difference in speed between the bike and the other vehicles in that lane creates a hazard. Thus, there’s no right place for a cyclist to be on this road if they’re planning to continue through the intersection.

When we combine the unavoidable ambiguity of the through cyclist’s intent with the very high left-turning speeds of oncoming traffic, we have a recipe for disaster. A recipe which has killed two people in three years.

Continue reading Preventing Bicycle Fatalities at US-36 and Violet

When shared cars kill

Peer to peer carshare cars are killing people, because cars of any kind kill people… not because they’re shared.  They’re big and heavy and fast, and they get operated in densely populated areas.  Anybody who thought this wouldn’t come up when they started setting up these services was delusional.  The thing I don’t really get is why on earth is the owner of the car liable for an accident involving it?  Assuming the car didn’t spontaneously explode due to poor maintenance, I presume the death and destruction is a consequence of bad driving, texting, drinking, poor road engineering, etc.  Just like all the other 40,000 people who get killed by cars in the US every year.  The problem that needs to be fixed here isn’t intrinsic to car sharing, it’s a problem with the way we assign liability in automobile accidents.

Links for the week of September 11th, 2009

If you want to follow my shared links in real time instead of as a weekly digest, head over to Delicious. You can search them there easily too.
Continue reading Links for the week of September 11th, 2009

Shared Links for Feb 18th

  • Do the British love their children too? – Two girls run over while biking to their school 3 miles away. British (and probably American) "solution": re-allocate a school bus to their area (removing the bus from somewhere else). Dutch/German/Danish solution: provide better cycling infrastructure for everyone. Guess which one I think is better. (tagged: bicycle transportation infrastructure accident bike )
  • MIT open prototype initiative – A project to produce modular, open (freely available, non-proprietary) prototype designs for energy efficient buildings. MIT is so awesome. (tagged: green architecture design building )
  • LEED Platinum Prefab Home Now Available – Taking all the design work out of building zero energy homes should make it a lot easier to build them, but the contractors doing the actual construction still need to understand what they're doing, and how their application of building techniques will affect the end performance of the building (and their profits need to be tied to that performance somehow) (tagged: green architecture leed construction buildings )
  • Kidnapping Chrysler – Of course Cerberus (private equity firm that owns Chrysler, not three headed dog guarding hell) has a "fiduciary obligation" to seek a handout from the Feds. And by Jove, the Feds have a fiduciary obligation to refuse to give it to them! (tagged: bailout chrysler cerberus crisis economy gm )
  • Where data goes when it dies – Following from the Ma.gnolia implosion, Chris Messina muses on data loss and recovery… kind of an information grieving process. What are we going to do with all of this information anyway? 100 years from now, all historians will have to be AI. (tagged: data archive backups loss microformats recovery )
  • What really happened at Ma.gnolia – The social bookmarking service Ma.gnolia was, despite its surprisingly large user base, basically run like Ideotrope – one guy with a server, and some (in retrospect) pretty janky backups. A couple of weeks ago, the 500GB MySQL database file got corrupted, the backups failed, and the site imploded. Lessons to be learned indeed: number one is don't do your own IT, now that S3, EC2, the Google Apps Engine, and other such scalable enterprise systems are available. We gotta get that server retired… (tagged: backups magnolia data servers hosting )
  • Baseline Scenario for 2009-02-09 – A rundown of the current global financial situation, and governmental attempts to get things under control. These guys aren't particularly optimistic at the moment about our ability to acknowledge just how beholden our supposedly powerful and developed governments have become to the banking industry. We're acting like Indonesia or Russia with their oligarchic overlords. (tagged: finance economy economics crisis )