The DOT's 4th annual Summer Streets initiative—which clears nearly seven miles of Manhattan streets of cars for 3 consecutive Saturdays—began today at 7 a.m. and ended at 1 p.m. Photographic evidence doesn't appear to confirm the theory that it's a "bikes-only affair." In fact, there were plenty of non-terrorists enjoying horn-free thoroughfares and pop-up sandboxes. Summer Streets will return next Saturday.

Tomorrow will also have a fair number of street closures thanks to the 11th annual New York City Triathlon. Triathletes will brave the pooey Hudson River, bike the West Side Highway, and run through Central Park— including transgender triathlete Chris Mosier, who will be competing for the first time as a male tomorrow. The Triathlon abides by Olympic guidelines which state that an athlete must wait two years following surgery and hormone treatment, but the owner of the Triathlete tells the Times “This is an age grouper who is out to have fun, God bless him. And I don’t think anybody is getting an inherent advantage going from a woman to a man.”

Here's a list of streets that will be cordoned off for tomorrow's event:

West Side Highway
Northbound Lane, 57th Street to the Moshulu Parkway.
4:30 AM - 11:00 AM

Moshulu Parkway
Henry Hudson Parkway to Gun Hill Road
4:30 AM - 11:00 AM

Riverside Drive
79th Street - 72nd Street
4:30 AM - 11:00 AM

79th Street
Riverside Drive to the Hudson River
4:30 AM - 11:00 AM

72nd Street
Henry Hudson Parkway - Central Park West
7:00 AM - 11:30 AM