What are the parts of the highway transportation system?

• A. Road engineers and pedestrians
• B. Roadway signs and signals
• C. The traffic police and signage
• D. Roadway users, vehicles and roadways

Answer: (D)

The highway transportation system is made up of three parts: roadway users, vehicles, and roadways. Roadway users are everyone who uses the highway—drivers, pedestrians, bicyclists, motorcyclists, and passengers. Vehicles are the machines we use to move people and goods, like cars, trucks, buses, motorcycles, and bicycles. Roadways are the physical places we travel on plus the features and controls that guide us—streets, highways, intersections, lanes, shoulders, medians, and the signs, signals, and pavement markings that regulate movement. These three parts work together every time you drive: your actions behind the wheel, how others behave, and the road environment all interact to determine safety and flow. The other descriptions focus on just one piece or on roles like engineers or police, but they don’t capture the full three-part system.