Strengthening Traffic Safety Argument

After a thorough investigation, local authorities have concluded that the rise in traffic accidents in downtown Hillcrest is largely due to the insufficient number of traffic lights at critical intersections. They argue that installing additional traffic lights would reduce accidents, improve traffic flow, and increase safety for pedestrians.

A transportation safety expert supports their conclusion, stating that cities with an adequate number of traffic lights report lower accident rates and shorter wait times. However, opponents of the plan contend that merely installing more traffic lights may lead to longer wait times for drivers, potentially reducing the overall efficiency of the transportation network.

To strengthen the authorities' argument, which of the following would provide the most support for their conclusion?