What is the traffic volume cut off between high-volume and low volume?

The question is not something with an absolute answer as there is more than just traffic volume involved in the answer. The number of trucks and functional classification of the highway also need to be reviewed. From chapter 2 in our Basics of a Good Road workshop manual, here are simple definitions of the various functional classifications.

Solitary horse and buggy riding down a hillBusy highway

 

Here are a few points that are worth nothing.

Classifying a highway is not always easy as many roads and streets serve both as a local road where people live and a collector that brings traffic to the arterials. In fact, some people live on arterials. Here is a link to the functional classification maps that show what NYSDOT and FHWA have designated for various highways around the state.

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This work by the Cornell Local Roads Program (CLRP) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.