I use retractable leads for my dogs but only in woods or open spaces where I can’t let them off lead.
Perhaps there could be a warning sign on the leads when they are sold, saying they should not be used in busy built up areas or near people and children. I don’t think the owners even think about it.
I have seen a few places where it states dogs are allowed if kept on short leads.
Perhaps signs saying “FLEXI LEADS ARE A TRIP HAZARD - SHORT LEADS ONLY PLEASE” might work?
Or even “FALLING OVER A FLEXI LEAD COULD COST YOU IF YOU'RE SUED - KEEP YOUR DOG ON A SHORT LEAD IN BUSY PLACES!”
Just a thought ?
Changing from a Manual car to an Automatic after driving manual for around 50 yrs



