That website is a helpful resource, but I just looked at two of the detail maps on it which include Bergen county, and those detail maps do not come close to rating (or even showing) most of the roads and streets -- especially they omit lots of the low-traffic streets in residential neighborhoods.

Perhaps a more accurate description of the website is that is rates most of the primary and secondary roads in New Jersey -- and lots of smaller roads in rural areas.

In my town it includes no more than 5% of the total roads and streets -- and approximately 0% of the low-traffic streets.

Ken