When riding in an urban right lane alongside a line of parked cars, what is the 'door zone' hazard and how should a motorcyclist avoid it?

1. Parked car doors emit magnetic force fields that pull motorcycles toward them
2. Parked cars will automatically back out at 100 km/h without their engines running
3. Riders should ride within 10 centimeters of parked mirrors to fold them in safely
4. Occupants may suddenly open car doors directly into the motorcycle's path without looking; riders should maintain at least 1.5 meters of lateral clearance (Position 1 or 2 in lane)