What technological advancement began in the 1950s that allowed for rapid police response to calls for service?

The correct answer is two-way radio communication, which revolutionized police operations starting in the 1950s. This technological advancement allowed for real-time communication between officers in the field and dispatchers. Prior to its widespread implementation, communication methods were often slower, involving written messages or telephone communications that delayed responses.

Two-way radios enabled officers to receive immediate updates and information about ongoing incidents, which significantly enhanced the ability to respond to calls for service quickly and efficiently. This improvement in communication not only meant faster response times but also improved coordination among police units, leading to more effective law enforcement overall.

The other choices, though relevant in their own contexts, did not emerge as pivotal technological advancements for police response in the 1950s. The use of motorcycles, for instance, has been utilized for police patrols but does not inherently increase the speed of response relative to communication capabilities. Online crime reporting came later, as did the technology for police helicopters, which are more focused on aerial support rather than direct communication impacts.