TheLeft-Side-Of-The-Road Rules To keep safe, run facing traffic."While running, it's better to watchthe traffic than to have it come up from abaft you," verbalizes Adam Cuevas, a marathoner and chiefof the Enforcement Accommodations Division of the California Highway Patrol. It's the law in Californiaand many other states to run on the left side unless you're on the sidewalk.The Exception: Theright side of the road is safer when running into leftward blind curves where there's a narrowshoulder. The right side can withal be safer if there's construction on the left side.14. The Up-Beats-Down Rule Running uphill decelerates you more than running downhill expedites you.So, youcan expect hilly runs to be more gradual than flat