Originally Posted by
spare_wheel
With all due respect there is little debate in cycling advocacy that new separated infrastructure tends to concentrate bike traffic along particular routes. These kinds of individual examples do not provide good evidence of correlation between the installation of new cycling infrastructure and increases in overall mode share, which is the topic of this thread.
You are so right! I've rarely seen such a definitive example than our very own Minuteman Bikeway.

Here, you can *see* the Minuteman Bikeway concentrating the traffic - the red/orange diagonal line above.
Even the minor Reformatory Branch Trail between Bedford and Concord (the red dot above) - is concentrating the traffic along itself too!
But wait, let's look a bit closer.

Huh, well, turns out the Reformatory Branch Trail doesn't actually concentrate any bicycle traffic. In fact, cyclists seem to be taking to Concord Road instead. Could be because the Reformatory Branch Trail is a mostly unimproved dirt path? But still, it's completely clear that the Minuteman Bikeway concentrates the traffic along the bikeway.
But wait, let's look a bit closer still.

Well I'll be, turns out that *LOTS* of bicyclists take the Minuteman Bikeway, but *LOTS* of bicyclists take Mass Ave too. Wonder why?
Hint, it mostly depends on start location and end location of your trip, and personal preferences.
For example, if you are heading to Alewife Station (next to "North Cambridge" label above), you'll probably end up taking the Minuteman Bikeway if you are coming from the northwest.
And you might even lock your bicycle in the secure bicycle specific parking infrastructure which they've built. Odd how bicycles have come to fill them all up.
(Data from Garmin, hinting at the power of crowd sourced data.)
-mr. bill