Who has the right of way between a mobility scooter which is used on pavement only and car crossing the pavement from their property to get onto the road? I had a very very close call last week and was berated by the car driver who said 'where the devil did you come from?. There is a fairly high wall and I reached the gateway as the car came out forcing me to swerve violently. I have ,maybe mistakenly, always assumed that pavement users had the right of way.According to me, the driver is unable to see anyone until the bonnet of their car is clear of the gateway and that can be too late!
I don't think hi-viz is going to cut it through a wall Methyl.
I would politely suggest they get blind spot mirrors for their driveway and property before they kill a child, then ask them if they would stand over that child shouting at them to pay more attention like they did to you.