SCB: Speed Is Not The Problem
A lot of folks (especially Stuart Werbner and Preston Tyree, who normally do a lot of good work for the cycling community) fell hard for the position that "the problem on Shoal Creek Boulevard isn't the bike lanes, it's the traffic speed". Since this position continues to rear its ugly head in discussions before and after yesterday's meeting, I thought I'd address it here.
The key is that all other things being equal, higher car speeds do indeed result in less safety for nearby cyclists and pedestrians. This is unquestionably true.
The problem is that all things aren't equal. This picture shows a cyclist trying to pass a parked vehicle at the same time he is being passed by a moving vehicle. It doesn't matter if the passing vehicle is going 45 or 25; if the cyclist veers out unexpectedly into the through lane and is hit, they're in bad, bad, BAD shape. (Note: you have to imagine that the stripe between the 4-foot 'bike lane' and 6-foot 'parking lane' isn't there to match the current conditions on SCB).
Likewise, this infamous accident happened despite the fact that the conflicting vehicle's speed was 0 MPH and the vehicle which ended up killing her wasn't going very fast either.
On the other hand, hundreds of cyclists use Loop 360 every day with no conflicts with motorists. Automobile speed in the through lanes of that roadway is typically around 60 MPH.
What can we conclude? Traffic engineering seeks to avoid presenting users with unexpected conflicts; and having a cyclist veer out into the travel lane when the motorist in that lane thinks they're not going to have to is the very definition of unexpected. A safe pass by a car going 40 is far preferrable to a collision with a car going 30.
How does this apply to Shoal Creek Boulevard? It's clear to me at least that the original city plan probably wouldn't have reduced automobile speeds much, but definitely would have resulted in fewer conflicts with cyclists who need to leave the bike lane to get around obstructions. As on Loop 360, if you rarely need to leave the bicycle facility, you don't need to worry as much about the speed of the cars in the lane next to you.
Another thing Preston in particular got wrong was the theory that riding on Shoal Creek is 'easy' once you 'learn' how to pass. Even for an experienced cyclist like myself, the conflict with motorists during a pass is irritating (the motorists don't understand why I go into the travel lane and are sometimes aggressive in expressing their displeasure). For a novice cyclist, it's likely to be so intimidating that they will (unwisely) stay in the far-too-narrow space between the white stripe and the parked car, and someday soon somebody's going to get killed that way.
Finally, of critical importance to the City of Austin is the following paragraph, excerpted from a detailed analysis of the Laird case in Boston:
The City might be held negligent for creating what is called in legal language an "attractive nuisance" -- that is, a baited trap. Ample evidence exists that the City of Cambridge had been notified of the hazards of bike lanes in the "door zone" before the Massachusetts Avenue lane was striped, yet the City continued to stripe them.
This is basically why Shoal Creek Boulevard doesn't have bike lanes today, it has a "multipurpose shoulder". Unknown whether this will do enough to shield Austin from liability in the event of an accident, but cyclists ought to think about this when you decide to ride on this facility.