Bicycle Sunday is a day when you can bike, jog, ride, walk or skate the Bronx River Parkway from the Westchester County Center in White Plains to Scarsdale Road in Yonkers. Bicycle Sundays have been a Westchester tradition since 1974. More than 60,000 participants each year bike, walk and jog a 13.1-mile loop of the Bronx River Parkway from White Plains to Yonkers. Unauthorized motor vehicles, including electric bikes and scooters, are not permitted on the Bronx River Parkway and the Bronx River Pathway.