Remember This Hashtag – #marathonfunday

Quick, what's the biggest car-free event of the year?

Summer Streets gives New Yorkers the longest stretch of contiguous roadway with no traffic, but marathon Sunday might reclaim more asphalt -- even if you don't count the route itself, all the car-free side streets along the way add up.

Of course, if you get up early enough you can enjoy block after block of the marathon route before the course gets cleared for the race. Doug Gordon and his daughter Galit did it last year on Fourth Avenue in Brooklyn and it looks like a ton of fun.

This year there's a movement afoot on Twitter to capture the spirit of car-free New York City streets on marathon day. To share your photos, use the hashtag #marathonfunday.