The incident occurred at Northern Boulevard and 80th Street about 8:45 a.m., authorities said.
Patients and residents say they have to dodge oncoming cars while crossing the multi-lane road.
The unidentified cop sustained minor injuries in the crash at Liberty Avenue and Barbey Street.
Javier Hernandez, 28, of Brooklyn, hit and killed a 3-year-old man and fled, police say.
The collision occurred near the West 79th Street exit, the FDNY says.
A dozen people were involved in the crash, which closed a section of the Belt Parkway, sources say.
Three people reportedly sustained minor injuries in one of the collisions on the Major Deegan Expressway.
Get our daily Afternoon News Update
Thank you for signing up!
Would you like to sign up for additional newsletters?
Thank you for signing up for additional newsletters.