I like it. Great for running stores!
I posted on the same shirt idea here.
My two cents on a design would be the CS logo “street” (only) on front, URL and some text on the back, maybe “Can you run them all?” or “How many have you run?” I suspect most people will see more of the back, than the front, as one whizzes by. 
Or…
Note: I tried to copy the color of the CS logo, and font, but was not very successful. 