<P> Power door locks (also known as electric door locks or central locking) allow the driver or front passenger to simultaneously lock or unlock all the doors of an automobile or truck, by pressing a button or flipping a switch . </P> <P> Power door locks were introduced on the luxury Scripps - Booth in 1914, but were not common on luxury cars until Packard reintroduced them in 1956 . Nearly every car model today offers this feature as at least optional equipment . </P>

When did cars start having automatic door locks