We moved into our new home. We are in a semi-detached with a shared drive between two houses. We have a place to park in front of our house and our next door neighbors have a garden instead. I guess they've always been able to park in the space between the two houses, but it's a SHARED drive...and they are not exactly the most friendly people - wouldn't even stop to say 'hi' when we saw one of them before we moved in. We're trying to figure out a way to tell them that they need to NOT park there, as I think their old neighbors (renters) didn't care. But we want to always have access to the back of the house. They tend to park only in the evening after 7pm and leave by 7am, but what if I want to move the trash? What if I wanted to move something to the back garden? What happens in the summer when we have a party? Do people have to go through the house? While it's not a huge deal, we also feel that as it's a shared access, they ought not to be blocking it up and ought to park out front (as they choose to have a garden instead).
How can we bring this up without sounding entirely rude or obnoxious?