Bicycles don't cause…

Bicycles don't cause congestion, cars cause congestion. To reduce congestion, get cars off the road, not bicycles.
I enjoy walking. There are places I won't walk, because I am afraid of being run over by a bicycle coming up silently behind me. Since a bicycle lane was added to the bridge near my house, I have felt comfortable crossing it on foot without worrying about being startled and jumping into the water on one side or the traffic on the other.