The first one-way radio car was deployed in 1929 in which city?

• A. Detroit
• B. Boston
• C. Philadelphia
• D. Seattle

Answer: (A)

Understanding how police communications evolved helps explain why Detroit is the best answer. In 1929, Detroit became the first city to equip a patrol car with a one-way radio, allowing officers to transmit information directly from the field to the dispatch center. This represented a major shift from relying on telephones or riders and led to quicker incidents reporting, better status updates, and more coordinated responses. The one-way system meant the car could send messages but not receive them directly in the vehicle, a stepping stone that preceded full two-way mobile radios. Other cities eventually adopted mobile radio systems as well, but not at that earliest milestone in 1929, making Detroit the pioneering location. This development also spurred changes in radio discipline and dispatch procedures that improved overall police communications.