Figure 4 shows
the point at which you should open your door.
At a mere 0.5 metres any motorist should be able to see oncoming
traffic. By opening your door you will alert other motorists
to the fact that you will be disembarking your vehicle and
that they should exercise a degree of caution as is the style
when human people occupy the motorised carriageway.
Notice how the blue car brakes heavily to give a visual and
audible signal of its presence.