Main traveled way.
Main traveled way. The traveled way of a highway on which through traffic is carried. In the case of a divided highway, the traveled way of each of the separated roadways for traffic in opposite directions is a main traveled way. It does not include such facilities as frontage roads, turning roadways, or parking areas.
Source
23 CFR § 751.7
Scoping language
For purposes of this part, the following definitions shall apply: