interesting, Jim. I don't use the term "bolus" but do exactly that when heading south on Washington St. in Roslindale on my way home. There are tons of cars parked to the right, and everyone's traveling fairly quickly, so it's treacherous unless you take to the sidewalks until the "bolus" as you call it passes. then I duck back out on the road and haul.
I also do FRAP even though my VC friends would say I should take the lane more often.
I bet it helps to be a reverse commuter!