Traffic control devices are signs, signals, pavement markings, and other installations that regulate, warn, and guide road users. Categories include regulatory devices (stop signs, speed limits, turn restrictions), warning devices (curve warnings, pedestrian crossings), and guide devices (street name signs, route markers). The Manual of Uniform Traffic Control Devices for Canada provides standards ensuring consistency across jurisdictions. Proper installation, maintenance, and visibility of traffic control devices are essential for road safety. Municipalities install and maintain traffic control devices on local roads while provinces manage devices on provincial highways. Traffic engineering principles guide device selection and placement. Liability concerns require municipalities to maintain devices properly and update them as conditions change.