EAST MEADOW - The Nassau County police officer who was hit by a car while performing radar speed enforcement remains in critical condition tonight. The officer, a 29-year veteran of the force, was struck by a driver in an Audi on the Nassau Expressway yesterday, just north of the Atlantic Beach Bridge. The driver remained at the scene and has not been charged. Police say the circumstances of the incident remain under investigation. They have not been able to interview the injured officer because he remains heavily sedated. The 57-year-old officer suffered serious injuries, including a fractured pelvis, fractured skull, fractured leg and massive internal bleeding. He was scheduled to have surgery on his pelvis today, but the procedure has been postponed until tomorrow. News 12 Long Island has learned the officer's name, but is not releasing it to respect the family's wish for privacy.Police are urging anyone who may have witnessed the incident to contact them by calling 1-800-244-TIPS.To watch Chopper 12 footage from the scene of the accident, go to Optimum TV Channel 612 and select 'News 12 Extra.'