Not too long ago, the U.S. government asked Toyota to make the Prius noisier. Apparently, being so quiet makes the Prius more of a hazard.
When you are quiet, people will physically bump into you more often.
Many of us walk around in a state of cell phone induced unawareness. The only thing that gets our attention is a firm shake or a loud noise.
Since i am trying to be more quiet in every aspect, loud footsteps or a spoken "excuse me" are not options. So in order to avoid a collision, i have to be sharp and able to weave like a quarterback on a moment's notice.
In essence, other people's unawareness has necessitated an increase of my own.