Success in the driving task depends on the drivers’ ability to receive and use information from many sources, including traffic control devices. Principles of driver information needs and processing capabilities are discussed in this module, as well as principles of uniform traffic control devices and the role of the Manual on Uniform Traffic Control Devices. Types and applications of signs, pavement markings, and traffic control signals are discussed. Principles of traffic signal phasing and timing, and signal system operation are covered. Traffic control devices for highway-railroad grade crossings and highway work zones are also emphasized in this module.