On Mar 14, 3:35 pm, Tricia Kovacs <
pkov...@att.net> wrote:
> Dear BicycleDrivers and Chainguardians,
>
> I did read the report from DC on the cycletracks and other bicycle
> infrastructure. Besides the crash data which I already mentioned in my
> previous email, here are some other interesting tidbits.
>
> *Bike boxes, bicycle signals and sharrows were installed at the 6 leg
> intersection of New Hampshire Ave/16th St/U St NW.*
> The bicycle signals cause delays for everyone during the a.m. peak, and
> >75% of cyclists do not use them because "it was not worth the time to
> wait" for them. Most cyclists (>50%) are using the crosswalks rather
> than the combination of bicycle facilities available. Only 18% of
> cyclists stop in the bike box, the other 82% stop in the crosswalk; but
> the study says the bike boxes are successful because only 15% of the 18%
> who use the bike box found motor vehicles encroaching. Despite all this
> non-use of the bicycle infrastructure, the preliminary recommendations
> do NOT include removing any of the infrastructure. Hmm, I wonder if the
> consultants from Kittelson, Portland State Univ and Toole Design Group
> have ever read the Emporer's New Clothes?
> *Perception*: "perceptions of the facility are generally positive from
> both cyclists and motorists"
> *Reality*: crashes increased from 4 in 4 years (before) to 5 crashes in
> 13 months (after)
>
> One of the recommendations made me laugh out loud. They recommend that
> the dashed bike lanes crossing 16th St should be moved as close as
> possible to the crosswalk to increase visibility of cyclists to turning
> motorists (there is a lot of right turn on red conflict). Hmm, most
> cyclists are using the crosswalk, let's move the bike lane closer to the
> crosswalk. (Just to be clear, this is not recommending that cyclists
> swerve right while traveling through the intersection, you need to look
> at the pictures on pages 5 & 8 to see how they have the bike lanes
> crossing the 6 legs).
>
> *Pennsylvania center cycletrack*
> The motorized traffic decreased on Pennsylvania by 20% and 15%
> (different sections) after installation of the cycletrack, and the
> reason was "not entirely clear". I wonder if they measured the traffic
> volume on parallel streets? As I observed when I rode the cycletrack,
> 44% of motorists indicate that signals, signs and street markings do not
> make it clear who has the right-of-way at intersections. This study was
> written before bike signals were installed, when cyclists were
> instructed to use the traffic signals, yet cyclists still encountered
> large delays due to changes in the signal timing to separate left turn
> from straight through phases.
> *Perception*: "Cyclists overwhelmingly indicate that they felt riding a
> bicycle on Pennsylvania Ave with the center bike lanes is safer and easier"
> *Reality*: 9 crashes in 4 years (before), 16 crashes in 14 months (after)
> The study admits this is a problem as bicycle volume tripled, yet
> crashes increased about 7 times.
>
> I'd be interested to see a follow-up study since bicycle signals were
> installed. I really hate that turning cyclists are now instructed to use
> the crosswalk for left and right turns.
>
> *15th St NW left side cycletrack*
> When this report was written, there were no bicycle signals, so cyclists
> were instructed (with signage) to use the pedestrian WALK signal. This
> was necessary to prevent left turning motorists from hitting straight
> through cyclists. Cyclists traveling between I St and U St generally
> experience significant delay. Many cyclists (20-30%) use the vehicular
> signals, and 40% ran red lights. (Note: I used the vehicular signals
> when I rode this cycletrack because I didn't see the signs requiring me
> to use the pedestrian signals.) Signal timing is optimized for
> northbound traffic, since 15th is one way northbound north of
> Massachusetts Ave; therefore southbound cyclists must stop frequently.
>
> There are lots of pedestrian conflicts and vehicular conflicts when
> cross traffic blocks intersections. Pedestrians feel cyclists are not
> yielding to them at intersections. Just under half of motorists find
> waiting for a green arrow to turn left to be a major inconvenience, and
> 2/3 find turning into alleys to be difficult.
> *Perception*: "Cyclists overwhelmingly feel that riding on 15th St with
> the cycletrack is much safer and easier now... and that they would go
> out of their way to ride on the cycletrack as opposed to other streets."
> *Reality*: 20 crashes in 4 years (before), 13 crashes in 14 months (after)
> >
http://ddot.dc.gov/DC/DDOT/Publication%20Files/On%20Your%20Street/Bic...
I downloaded and read that report too, and I thank Tricia for giving
the link. I discussed it at our bike club meeting last night.
One thing that struck me were the statements like "There were 5
bicycle crashes at the intersection during the first 13 months after
implementation, compared to a total of 4 bicycle crashes during the
previous 4 years. The low number of total crashes and limited length
of time observed for the after period (13 months) is too short to draw
definitive conclusions..."
What the heck??? Quintupling the crash rate for a year isn't enough
for conclusions?
By contrast, a recent study comparing a Mediterranean diet plan to a
more conventional low-fat diet was terminated early because findings
were indicating a 30% reduction in risk for the Mediterranean diet.
They said it would be unethical to keep the control group away from
the Mediterranean diet.
Again, we see that clearly increased danger isn't enough to dissuade
proponents of "innovative" facilities. We need ways to get through to
these people.
- Frank Krygowski