What provides guidance on the types of flares, cones, and signs used in traffic control?

The correct answer is the Manual on Uniform Traffic Control Devices (MUTCD). This manual serves as the primary standard for all traffic control devices, including signs, signals, and markings used on public roads. It outlines the specifications for various traffic control devices, including flares and cones, detailing their design, placement, and usage to ensure consistency and safety across different jurisdictions.

By following the guidelines provided in the MUTCD, emergency responders and traffic control personnel can effectively manage traffic in a safe manner, minimizing the risk of accidents and ensuring the safety of both responders and the traveling public. Other organizations like the FHWA, NHTSA, and DOT influence traffic safety and regulations, but it is the MUTCD that specifically focuses on the standards for traffic control devices.