WHEN DID THE N.Y.P.D. FIRST BEGIN USING RMP'S (RADIO MOTOR PATROL CARS)?

The first patrol car was used in 1917. Later when radios were installed, the radio inside the vehicle could only receive messages. This required the officers to pull over to a call box and acknowledge the messages when received. In 1937, technology had improved and two-way radiotelephones were installed in RMPs. It wasn't until 1950 that all police cars had two-way radios.