Which of the following are considered "critical data" for road safety?

Traffic volume is considered critical data for road safety because it provides essential insights into the number of vehicles on the road at any given time, which directly correlates with the likelihood of accidents. Higher traffic volumes can lead to increased congestion, more interactions between vehicles and pedestrians, and a greater potential for crashes. Understanding traffic flow patterns helps in identifying high-risk areas, optimizing traffic control measures, and implementing effective safety strategies to reduce collisions and protect road users.

In contrast, law enforcement citations, driver history, and injury surveillance and EMS data, while important, serve different functions in the context of road safety. They contribute to understanding the factors that lead to accidents and the outcomes of crashes but do not directly represent the conditions of road usage in terms of volume.