The previous post regarding the lousy paving job along the gutter pan on Diamond near the high school re-ignites the old question of where a rider should be riding. In references such as Effective Cycling and Street Smarts cyclists are warned not to ride too close to the edge for a variety of reasons: broken pavement, lack of room to manuever, road debris, and the tendency of drivers to think they can pass you without changing lanes, possibly leading to being sideswiped.
Riders should be inboard of the gutter pan a couple feet. I think John Forester suggests riding approximately where traffic markings indicate the right hand tires of motor vehicles are located.
Here is a reference on roadway positioning from John Allen.