Portland, Oregon is one of several U.S. cities with a
progressive bicycling culture. A couple of innovations the city
has implemented are "bike boxes" and "sharrows". Bike boxes are
road markings that designate exactly where cyclists and
motorists should place their vehicles when stopped at an
intersection with a red light. The main idea is to prevent the
notorious "right hook" as a cause of collisions. The jury is
still out in terms of effectiveness, but bike boxes are
receiving mostly positive reviews so far. (On wikipedia these
are called Advanced Stop Lines and around here they're called
"green boxes".) Sharrows are shared lane road markings on
roads/lanes shared by cyclists and motor vehicles. In Portland,
they are found on city designated bike routes without bike
lanes. The idea being that it's a visual cue to cyclists and
motorists that the lane is to be shared. Question: What are
other infrastructure modifications a community can make to
enhance bicycling safety?