What advancement in communication allowed for better dispatching of police service calls?

The advancement of radio communications significantly improved the dispatching of police service calls. This technology enabled real-time, two-way communication between dispatchers and police officers in the field, leading to more efficient responses to incidents. Unlike the telegraph or landline telephones, radio communications allowed for immediate, on-the-ground coordination and updates without the need for officers to return to a central location to receive instructions or information. As a result, police departments could deploy resources more effectively, respond promptly to emergencies, and maintain constant contact with units in the field, enhancing public safety and operational efficiency.

While other options contributed to communication methods at their respective times, they did not provide the same level of immediacy and flexibility as radio communications did in police work.