🏛️Federal & Industry Standards
Highway Capacity Manual (HCM)
WebIowa Department of Transportation (Iowa DOT)2023 Standard Specifications
The Highway Capacity Manual provides methods for quantifying highway capacity and determining quality of service for transportation facilities including freeways, highways, arterials, roundabouts, signalized and unsignalized intersections, and transit.
Published by the Transportation Research Board (TRB). 7th Edition, 2022.
Document Viewer
🏛️
This source must be viewed on IADOT's website
State DOT portals frequently block embedding via X-Frame-Options or Content-Security-Policy headers. Open the canonical source to view the current publication.