This prohibition, which has been in effect for decades, addresses both public safety and public works concerns. With no cars on the street at night, it is easier for patrol officers to determine if a parked vehicle might pose a threat to residents. Streets free of parked cars at night also allow fire, police and medical rescue teams to respond more quickly. If it snows, public works is able to plow during the night without damaging or blocking in vehicles, ensuring everyone can get to work or school in the morning. Also, it prevents people from dumping inoperable cars on the road, where they become junk and permanently block access.