You can leave a door open on the side of a vehicle near moving traffic, pedestrians, or bicycles:

• As long as you are parked in a safe area
• For as long as you need to if the road is clear
• Anytime, as long as the door is not in the traffic lane
• Only for the time necessary to load or unload passengers
  Explanation:

  "No person shall leave a door open on the side of a vehicle available to moving traffic, including pedestrians and bicycles on sidewalks, shoulders, or bicycle lanes, for a period of time longer than necessary to load or unload passengers."