Interesting, I find that my morning commute is a 3c/d (average 3-4x speed traffic), my evening a commute ranges from 3c/d (average 3-4x speed traffic) and 2c/d (dense 2-3x speed traffic) with sometimes narrow lanes - in fact the densest 50mph traffic is where there are the narrowest lanes.

I often find it difficult and stressful to deal with negotating with traffic especially with narrow lanes. Maybe I shouldn't be riding in 2c conditions with narrow lanes. For some reason I though that riding in the center of the lane was safe.

Fortunately none of these have on street parking. That is only on the 25-25mph residential streets where traffic is relatively light.

Al