Who do traffic lights apply to?

Answer: D — Pedestrians, cyclists, and motorists

Traffic lights are designed to regulate the flow of all types of roadway users, including pedestrians, cyclists, and motorists. Each of these groups has specific signals that guide their behavior at intersections. For instance, a green light signals motorists to go, while red lights indicate a stop. Pedestrians are guided by walk and don't walk signals, ensuring their safety while crossing. Cyclists, using bike lanes or sharing the road, also must adhere to the signals, just like motorists. Thus, traffic lights apply to everyone on the roadway to promote safe and orderly conduct for all users.