Engineering information on Traffic Counts, Roadway Data, Traffic Regulations, existing transportation facilities and other similar subjects may be found in Reference Data. Bollard Rigid posts that can be arranged in a line to close a road or path to vehicles above a certain width Byway Highway over which the public have a right to. Training is an important first step before using the HSM. Following is a brief description of the various training programs currently available to help state DOTs. Construction Manual For Highway Construction© 2017