With regard to Joggers, for my sins this is an activity I have taken up (prepares to duck and weave), what's next, swimming!
I have to let you know concrete footpaths really take their toll on your legs, grass sucks up your speed and strength, although a nice temporary cushioning. Tarmac does have some give, certainly more than concrete. I always stay close to the curb where safe, however keep fit walkers in the road do frustrate me, one old guy on my estate is almost in the middle of the road and to his right is a near new concrete path.
I did a 10k run Sunday (I had to split it at the 8K mark but that's another story) most of it has no footpath, on the gravel road I ran in the middle but towards the right where less deep gravel gathers, however in the act of self preservation there are some tight twists so rather than shock a motorist or cyclist zooming around a blind left corner I switch road sides to prevent wiping out, road rage or driver shock and run with the traffic.
No iPods on, so I can hear things too. At night I attach a flashing red knog to my left hip and run so it's closest to the traffic so it can be seen front and back and a headlamp up front on the head, I do bow my head as the car gets closer to prevent them getting blind and in return them not flashing lights and blinding me! All in non ninja clothing.
Self preservation is the key; with or without wheels.