One of the great, but perhaps underused, features of Big Truck Guide is the collection of links to external sources. These have been completely revamped and updated in October 2019, and are continually being updated throughout the year.
For each state and province, 2 different links are supplied. The first is a link to the state or provincial website or PDF document that explains the regulations in that jurisdiction. If there is a document available, it has been made downloadable from Big Truck Guide so that you will always have access. The second link is to the actual legal code where weight and dimension regulations can be found.