What's the opposite of drafting??

I slept in a little yesterday, which meant that I left for work about a half-hour later than I have been the past couple of weeks. I wouldn't have thought that it would make a big difference, but the traffic along the Millennium Trail was noticeably busier. The part of the trail I ride is right next to a road with a 40mph speed limit, so in the mornings I'm going in the opposite direction of the cars next to me,  and I can feel the "headwind" as they pass by. The worst part is this long stretch starting at the bottom of a bend and going up to an overpass; I don't enjoy going uphill anyway, and adding wind resistance to that--I guess it's a good workout. Here's a picture of the general area (although this was taken in the evening, when it was much more placid):

In the mornings I head in the direction of the green arrows,
while cars are speeding next to be in the direction of the red arrows 

I actually remember dealing with the cars last year since I used to leave later, and I disliked it so much that I found some alternate routes for the first stretch of my morning ride. What is this called, anyway? Not even D could tell me, and he's my go-to source for bike knowledge:

I do know about D's drafting! I don't really mind though because I have calves of steel

I definitely plan on keeping my AM departure early to avoid this unnamed phenomenon!