New York City Department of Transportation (NYC DOT) uses Automated Traffic Recorders (ATR) to collect traffic sample volume counts at bridge crossings and roadways.These counts do not cover the entire year, and the number of days counted per location may vary from year to year.

Daily total of bike counts conducted monthly on the Brooklyn Bridge, Manhattan Bridge, Williamsburg Bridge, and Queensboro Bridge.
For additional data, please visit the Bicycle Counts: https://data.cityofnewyork.us/Transportation/Bicycle-Counts/uczf-rk3c