Make it clean.
Bumper next to bumper is where overlap starts.
Door next to door is 100% overlap.
To obtain right of road position, the overtaker's car must have significant overlap of the car that is being overtaken, before they reach the corner's turn-in point.
The car on the outside has the right to outside room all the way through the corner, while the car on the inside has the right to inside room all the way through the corner.
(During an overtaking manoeuvre both cars can´t use the optimal line, so both need to slow down in order to stay on their side of the track.)