How big of an affect does 'stop and go' have when on a run?

Question

I live in a city. Cities have traffic. Traffic involves stopping and going, wether in a car, on a bike or running. I like to run and ride my bike as cardio work out. I recently moved to a new location in the same town. I used to run on a track. It's much easier for me to just go running somewhere outside, but how big of an impact does all the stop and go at crosswalks and streetlights have?

Answer 1

well if you are running relativley fast and you suddenly stop for 10-30 seconds and then start up again your breathing might increase slightly, but otherwise it wont affect you

Answer 2

I consider the traffic lights a bit of a break, but it does not effect your running, because this help you reenergize your run and its usually not long enough for you to cool down.  I wouldn't worry about it too much, you're out there running and cycling.  Sounds like your in good shape anyways.