What is the general purpose of traffic control devices (signs, signals, markings)?

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Traffic control devices are designed to regulate how traffic moves, warn about hazards, and guide people so everyone can travel more safely. Signs tell drivers what rules to follow, signals control who goes first at intersections, and road markings show where lanes belong, where to stop, and where pedestrians cross. This system helps reduce crashes by providing clear information to all road users—drivers, pedestrians, and cyclists alike—about what to do, where to go, and what to watch for. The idea isn’t to decorate the road or to fund fines, and it certainly isn’t limited to pedestrians alone; it’s about safety and orderly movement for everyone sharing the roadway.