A PHILOSOPHICAL QUESTION

Here is a question which few people would ask themselves and even fewer would attempt to answer.
A taxi arrives to collect you. You are not quite ready, so ask him to "Hold on a minute", whilst you go inside to lock the back door, collect and don your coat or whatever.
Not wishing to be rude and to save time you leave the front door open with the driver standing there.
Have you been polite or have you unwittingly placed a burden on the driver? He may wish to go back down the garden path to prepare the car for you. e.g. open the passenger door, shake the mat and start the engine.
You have, however, given him the obligation to guard, on your behalf, the open drawbridge to your castle. Or have you?
I suppose it depends on the drivers and your own sense of obligation and responsibility.
Discuss.