No traffic. Best sights of London along the way. To quote the great, if this isn't nice, then I don't know what is. The path starts in Greenwich right on the banks of the Thames, proceeds to National Cycle Route 1, goes through Dartford and all the way to Gravesend. Canary Wharf, the Millennium Dome, as well as other great views are yours to enjoy at your own pace, all thanks to the area being completely traffic-free.