This video shows the criticality of proper lane position to the bicycle and rider when stopping at a red light or stop sign.  Reported in "Bicycling" via an email distribution I subscribe to. 
WARNING:  this video is graphic and profane but it is a real situation and I experienced a similar event commuting to work.  The driver was traveling East in the morning sun and could not see the light color or me standing with my bicycle to his immediate left when he cut the corner short.  A close call but fortunately I moved out of the way before I was struck.

VIDEO

Police Officer Hits Cyclist