Forty cyclists were cited for infractions, including red light violations, illegal turns, and not signaling, when police conducted a bicycle safety and enforcement operation near Commonwealth and Massachusetts avenues.

Boston, Brookline, State, Transit and Boston University police staked out the area at 8 a.m. Thursday.

Police chose the location due to its history of bicycle collisions and other incidents.

Police also conducted an operation along Commonwealth Avenue at 4 p.m. Results of that operation were not yet available, police said.

During the two operations, police also gave riders dozens of free helmets and bicycle lights donated by the university.