Which part of a trafficway includes both the roadway and the shoulder?

The correct answer is the term "Road," which encompasses both the roadway itself and the adjacent shoulder. In traffic terminology, a road generally refers to the entire constructed right-of-way designed for vehicles and pedestrians. This includes not only the driven surface (the roadway) but also the area on the side where vehicles may pull over or where pedestrians may walk (the shoulder).

In contrast, a highway is typically used to refer to larger routes meant for long-distance travel that may have specific regulations or characteristics but does not necessarily denote both roadway and shoulder as inclusively as the term "road." A street often implies a smaller, urban thoroughfare that might include sidewalks but does not always specify a shoulder. A traffic lane refers specifically to the marked lanes on the roadway used for vehicle movement and does not incorporate the shoulder area. Thus, "Road" is the most comprehensive choice that accurately describes both components of the trafficway.