carry a can of white road paint and paint the lines underneath, on the top of the car.
There is a section of double yellows near where I used to live where people always park to use the shops. It used to block the traffic so badly that it sometimes would take me 20 to 30 mins extra to get home due to reducing the road to a single lane and traffic having to wait to pass the cars parked on double yellows.
Regularly saw the police queuing to get past and not doing anything.
So I started to.
I took to spraying two yellow lines down the side of any car parked on the double yellows with road mark spray.
Strangely enough people started to use the car park 20yds down the road…