Thousands To Ride In 5 Boro Bike Tour

The largest annual bicycling event in the U.S. happens Sunday on the streets of New York.

 32,000 cyclists participate in the TD Five Boro Bike Tour. And with the Boston Marathon bombings fresh in mind, some changes are in place.

Large backpacks and hydration packs are not permitted, but water bottles and fanny packs are.

The event also means rolling street, bridge and highway closures throughout the city beginning at 6:30 a.m. ahead of the event's 7:45 a.m. start along the 42-mile route through Manhattan, the Bronx, Queens and Brooklyn before concluding in Staten Island at 6 p.m.

For more information on street closures visit the NYC DOT website.