Few runners run on the sidewalks because concrete is harder on the joints than asphalt. I alternate between each side of the road because the surface isn't flat; the road crowns in the center, which means whichever leg is closer to the center of the road is a little "shorter." Switching between the two sides of the roads evens out the stress on the knees.
BUT - I never run wearing headphones, I keep my ears "open" listening for cars, in low light I wear light colored clothing and something retroreflective, and I recognize it's my responsibility to be as visible as possible. I know how much it upsets me to get "spooked" by someone who's wearing dark clothing and who doesn't appear to take their own safety seriously.
- 6/11/2014 8:05:24 PM