- If you have parked off the road or are leaving a parking lot, etc., yield to traffic before reentering the road.
https://www.dmv.ca.gov/portal/dmv/detail/pubs/hdbk/right_of_way#roway
A vehicle entering a roadway from a driveway, alley, private road or any other place that is not a roadway must stop and yield the right of way to traffic on the roadway, and to pedestrians. §1143 and§1151-a
http://www.safeny.ny.gov/roadrule.htm
除非有確實證據表明路上車輛是突然出現或故意撞上來