We live on a private estate where only residents are allowed to park, and then only in designated places. As we are fairly near a train station to central London we have suffered from non residents parking their cars on the verges and leaving their car all day, which means large delivery vehicles, the dustmen, emergency services etc cannot access the houses. We have a set of “No parking . Need emergency access “etc stickers which are really hard to remove which we stick on persistent offenders’ windscreens. We also have employed a parking company which can issue tickets, but we have never had to use them, people don’t like the stickers.