What's the difference between 停车 (tíngchē) and 泊车 (bóchē), which both seem to mean "park car"?
请勿泊车 = No Parking


  No Parking mean you can stop the vehicle there, and you can load or
  unload people and goods, but you can't leave the vehicle unattended
  and go off.




禁止停车 = No Stopping


  No Stopping means no dropping people off or picking them up, and no
  loading/unloading. You're not supposed to be there unless you're
  moving.


The signs above the text should clarify - they are international signs and there is only a slight difference between the individual meanings of Stopping, Standing/Waiting, and Parking, anywhere in the world.

No Stopping signs are the strictest, and No Parking signs are the most lenient.