The photo of the Western Avenue bikeway with this post has been making the rounds in bicycling advocacy circules, accompanied with praise for Cambridge’s plowing it.
You can praise the plowing all you like, but in terms of safety, it amounts to window dressing, distracting from problems which would not exist except for the segregated bikeway: with the snowbanks, bicyclists and motorists are both going to have to come nearly to a complete stop at every crossing to see each other in time to avoid collisions. Streets, on the other hand, even narrowed by snow, are wide enough that the cyclists can ride away from the edge, and motorists can poke out far enough to see approaching traffic without the risk of collisions.
The bikeway is also too narrow for one bicyclist safely to overtake another. The street is wide enough for anyone — bicyclist or motorist — to overtake a bicyclist, though maybe not always wide enough for one motorist to overtake another, what with the snow. It is narrower too because of the space that was taken out of it for the bikeway. The street also most likely is clear down to pavement within a day or two after a snowfall, and it is crowned so meltwater drains to the curbs. The bikeway is going to be a sheet of ice if there are thaw/freeze cycles, unless there is a very heavy application of road salt.
Bicycling is already difficult enough in winter without the added difficulties and hazards imposed by this bikeway.
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