…from the ESRI Map Book, Volume 24…
“These maps display the forecasted cost of a morning trip to downtown San Diego. The first three panels display costs for three modes: single occupant auto, high occupancy auto, and walk-access transit. Auto trip cost is calculated by using forecasted trip length and trip time data from the transportation model multiplied by cost factors for auto maintenance, tire degradation, fuel consumption, toll road use, and value of time.
“A fixed fee for parking is also added to all trips ending in the central business district which included a carpool incentive discount for high-occupancy vehicle (HOV) trips. Free use of planned managed lane facilities, along with trip time savings from use of dedicated HOV facilities, gives carpools an added cost savings over single auto travel. Transit trip cost is calculated by using forecasted transit trip length and trip time data (including access and transfers) from the transportation model which is multiplied by cost factors for transit fare and value of time.
“The fourth panel shows transit value areas by comparing the cost of single occupant auto travel to transit. The green areas shown on this map are neighborhoods in the San Diego region where the total cost of using transit is 15 percent less than driving solo in an automobile. Eighteen cities and the county government comprise SANDAG, the San Diego Association of Governments, which serves as a forum for regional decision making.
“Courtesy of Joaquin Ortega, San Diego Association of Governments.”