Boston has bike boxes!
These boxes allow cyclists to pass up and get in from of automobiles when stopped at intersections. It helps prevent cars from making turns unaware a cyclist is to the side and clipping them. Cyclists pull to the front of the line of stopped cars so they are visible and get a head start once the light becomes green. They also allow cyclists to make turns easier without having to maneuver across traffic lanes. They pull into the box and move across in front of stopped vehicles to make a safer turn.
The picture is from Comm Ave in the Back Bay part of Boston near where the APA Conference was being held last weekend.