On my commute there is a busy road with two lanes in each direction and a center turning lane. On my way in to work, I usually ride in the adequately wide shoulder (there is no parking on the street). On the way home though, I've been filtering past traffic on the right. However with two lines of basically stopped vehicles blocking my view, sometimes I can't see cars trying to turning left in front of the stopped cars and have nearly been left hooked. There is also a chance of being right hooked. In this situation, would it be safest to:
a) Filter on the right
b) Ride slowly in the mostly empty sidewalk
c) Filter through the middle
d) Filter on the left in the center lane (but sticking to the right edge of it)