Neighbours keep parking on my grass

Neighbours and their guests keep parking on my grass beside my fence. I work hard to keep the grass healthy so I get very upset everytime this happens.

I do not understand why people think it's okay to ever drive over someone else's lawn and park there.

Any ideas what I can do?

Neighbours and their guests keep parking on my grass beside my fence. I work hard to keep the grass healthy so I get very upset everytime this happens.

I do not understand why people think it's okay to ever drive over someone else's lawn and park there.

Any ideas what I can do?