Just picture yourself for a second sitting in your car and getting ready to get out of it. If you drive on the right side of the road than you would normally open the door with your left hand. In case you drive on the left than with the right.
It comes natural right? Well it is kinda wrong also.
The correct way to open the door is called : “The Dutch Reach” .
This technique is very simple and also taught in the driving schools as well.
It is based on an assumption that most of the people not even looking in the side-view mirror to check if anything is coming.
So the technique is very simple: you just open the door with the other hand forcing your body to turn in the process and you will be able to see if there is a bicycle or car coming.