I don't think that he law requires a tow bar, but it should ,for your own sanity . if you stop suddenly, the rope can get wrapped around the rear axle of your ATV ,if you don't pay attention. (heard of this happening, of course its never happened to me, I'm to smart for that !) Also heard that a Jet Sled Can Tip over in certain snow depths on the ice ( again, never happened w/ me!) . Here is an easy ,cheap suggestion for a tow bar. run some rope through a 6'-8' piece of 1" PVC . Tie a loop & put it on the hitch on the ATV . The rigid PVC will help keep the sled from running up under the ATV ,when you stop.