The North Boundary Greenway includes a couple loop options. Parking on the east end of the Quarry Trail allows one to connect with the NBG trail on the west end and then ride clockwise back towards Oak Ridge. Going all the way back to the NBG east terminus requires a short ride along Oak Ridge Turnpike back to the Quarry Trail parking area. Checkout the Oak Ridge Greenway site for additional information, such as when the trail is closed for hunting.