I love the charity or fundraiser rides that get some road or lane closures. It makes for a much better riding experience.
Unfortunately a lot of people zip down their driveways, past the sidewalks, but stop at the street to look for other cars before continuing. In the best case scenario they see the cyclist or runner and wait for them to pass. In the worse case you see them and can begin to stop or more over to avoid a collision. While they should be smart enough to stop and look before the sidewalk I don't trust my fellow man nearly enough to put my life in their hands while flying down the sidewalk at 20+ mph.
This is another situation where it is best to be a bit further from the curb. Not only could trees on the treelawn obstruct your view or the reversing motorists view but a motorist who is looking for another car will look more center on the lane and if you are cycling there as opposed to right against the curb you are more likely to be seen.
I guess I didn't realize that roads where made for your riding experience.. Wow, I thought they were for cars, getting people to where they needed to be. I must have been misinformed. Sorry, but bikers are a real pet peeve of mine.