A boozed-up off-duty city sanitation worker with two kids in the car was pulled over in Brooklyn early Saturday – then tried to pose as a cop to arresting officers, sources said.

Vellnet Veliu was spotted by police running several red lights about 12:30 a.m. near Bedford Avenue and Lenox Road in Prospect Lefferts Gardens, police sources said.

When officers stopped him they noticed two minors in the backseat – ages 5 and 7 – along with an odor of alcohol.

Veliu showed the cops a fake shield – and slurred that he was cop, sources said.

Cops slapped cuffs on Veliu and charged him with criminal impersonation, DWI and failure to obey traffic signal.