During the summer I run outside on the streets. I don't use the sidewalk too often because they are usually in questionable shape, you have to avoid other people and objects, and yes the asphalt is better on my knees. However, I try to run in industrial areas, and off main thoroughfares and ALWAYS run AGAINST traffic so I can see what's coming at me.. And yes, I know accidents happen all the time so I stay alert.. I'll also tell you this- once somebody threw a coke bottle at me while I was running so I turned around and sprinted after the car... Guess what???? They had to stop for a light. Now guess who got a nice sized roadside landscape boulder dropped on their trunk and rear window? So before any of you fat lazy bastards think about messing with joggers, remember 2 things- will I ever see this person again, and make sure it's not me