But before you go too crazy please define: "creating a more accurate picture of the surrounding area." If you mean editing the roads to add new roads and getting it so routing is working accurately, go for it. If you mean making the maps look like the google maps, stop. Go to the wiki and read the editing guidelines. We don't split roads because they are split on Google, we don't design intersections like google does.
The reason I say this is that those level 5 locks may be there for a few different reasons, first they may have been locked when the editors in question were lower levels and you needed to lock roads to keep the system from changing the edits. Or they may have been locked because other editors have tried to "create a more accurate picture" in ways that violated the editing guidelines and after spending some time fixing the edits, they locked the roads to prevent the changes from happening again. So make sure you understand how things are supposed to be done before you go asking for unlocks.