The Southern California Regional Truck Route Shapefile (RTRS) has been compiled using the general plans and municipal codes of the jurisdictions in areas of each of the six County Transportation Commissions (Imperial, Orange, Los Angeles, Riverside, San Bernardino, and Ventura). SCAG has developed standard data fields based on information found in local general plan and municipal codes to identify roadways and roadway segments that are designated as truck routes by the cities. The RTRS includes truck routes on existing local facilities. Jurisdictions use different criteria (e.g., weight, axles, time of day, etc.) to designate a truck route for their city. For the purposes of the RTRS, weight was used as the factor to determine truck route locations as this was the most commonly used criterion. Existing truck routes are those that are specifically identified as facilities where trucks are generally permitted during all times, or the majority, of a day. It should be recognized that most jurisdictions permit truck to travel on any roadway segment with clear limitations to their movement (e.g., direct delivery to locations not on a designated route). Each route is at the discretion of its jurisdiction. Confirmation and updates to the RTRS will allow SCAG member cities to understand and develop policy regarding intra-city and intercity truck route connections and gaps, and connections to industrial uses within jurisdictional boundaries.