Which of the following is NOT a functional classification of roads?

Answer: C — Express lanes

The correct answer is "C. Express lanes" because express lanes do not represent a standard functional classification of roads. Functional classifications typically categorize roads based on the service they provide to traffic, such as whether they are designed for higher-speed traffic (arterials), for access to various local destinations (collectors), or for direct neighborhood access (local roads). Express lanes, on the other hand, are typically special lanes created for specific purposes, such as tolling or bus rapid transit. They may exist within other classifications but do not stand alone as a type of road according to functional classifications. Thus, while arterial roads, local roads, and collectors serve key roles in transportation planning and are recognized categories, express lanes do not fit that same framework.