RESPONSE BY JOHN S. ALLEN
TO SUGGESTIONS BY
THE BSC GROUP
The report to which this is a response
Comments on Concord Avenue bike lane
The consultant makes some very good suggestions, in particular, for signage and
for tapering the right edge of the travel lane toward the right curb and/or installing
left-turn pockets in the median so left-turning vehicles do not block through traffic. I
also agree with him that the present bike lane narrows the travel lane excessively at some
locations. The heavy wear on the lane stripe at the left side of the bike lane confirms
this observation.
But the narrowness of the travel lane reflects another problem described on the previous page: there is not quite enough room for a bike lane.
The Concord Avenue roadways are just a bit too narrow for a standard-width bike lane to be
out of the range of opening car doors and for the travel lane also to be wide enough. Unless there is extremely heavy and fast motor
traffic -- not the case on Concord Avenue -- bicyclists can easily merge left to overtake
other bicyclists, making use of the travel lane width which is only intermittently
occupied by motor vehicles. Also, bicyclists' preferred position on the roadway depends on
whether or not parked cars are present. If there is a parked car, bicyclists check behind
them for traffic, and move somewhat to the left to avoid the hazard of opening car doors.
A bike lane encourages bicyclists to overtake on the right and motorists to turn right
from the left lane -- behavior which I have observed in the existing bike lane on Concord
Avenue. Dashing the lane stripes can somewhat reduce these problems, but motorists still
often think of a bike lane as a "sidewalk in the street" and keep left of it
before turning. It is hard for motorists to think of a bike lane as a "real"
lane, as it is too narrow for their vehicles. These problems occur wherever there are
cross streets and driveways, and do not occur, for example, on bridges where there is no
cross traffic.
For these reasons, I think that the bike lane with a stripe on either side delineating
a special channel for bicyclists creates more problems than it solves. I suggest a single
guide stripe similar to what Cambridge has implemented on much of Broadway, to delineate
the right edge of the 11 foot travel lane recommended by the consultant. In addition,
marked parking stalls would serve to indicate the parking lane clearly. "Share the
Road" and lane use signs as recommended by the consultant are appropriate. The lane
stripe should be tapered and dashed before the Stone Bridge underpass, to encourage
through-traveling bicyclists to merge left and right turning motorists to merge right
before reaching the underpass. Merging before turning is much safer, and is what the
traffic law requires (MGL Chapter 90, section 14).
The consultant also suggests the use of neckdowns or bulbouts to prevent motor vehicle
travel in the parking lane. They would certainly be successful in accomplishing that goal,
but this suggestion is somewhat at odds with the recommendation to widen the travel lane
at intersections. Certainly, the tapering and the neckdowns would have to be at different
locations. Pedestrian crossings would then preferably be at the locations of the
neckdowns.
All in all, I think that Concord Avenue in Belmont is an easy place to ride, because
there is only one travel lane in each direction, and there is generally adequate width for
lane sharing. But there is not quite enough room for a bike lane, and the bike lane that
has been installed also has problems at intersections. |