TRANSPORTATION CORRIDORY AGENCY - PUBLIC HEARING NOTICE - EST 1986

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M growth. The portion of cost based upon existing trio ends represents the benefit to developed properties. Revenue for the cost allocated to existing development will be provided from public funding sources identified in Section V, "Overall Financing," of this report and, therefore, will not be assessed to individual properties. The methodology used to determine the ADS consisted of determining the influence the corridor had on trips made within the County. The analysis was conducted with a system of computer programs known as UTPSI (Urban Transportation Planning Systems). The computer programs were tailored for specific Orange County application and are commonly known as the SOCCS2 travel demand model. The model subdivides Orange County and portions of adjacent Los Angeles County into more than 500 traffic analysis zones (TAZ). The model esti- mates the number of person trips each TAZ generates based on socioeconomic variables such as population, employment, income and number of housing units. These trips are then distributed from each zone to all other zones by a well - established procedure. The model then determines how many of these person trips will travel by auto, and finally assigns these auto trips onto a highway network. The socioeconomic data used in the AOB analysis is from the San Joaquin Hills Transportation Corridor Study and the Foothill Transportation Corridor Study. Using the trip - making data described above, a select 'link analysis (program UROAD3) was performed to determine the number of corridor related trip ends which originate in, or are destined for, each traffic analysis zone (TAZ) . These corridor TAZ trip ends were used in conjunction with the total TAZ trio ends (arterial highways plus corridor) to compute the percentage of trip ends by TAZ which use the corridor. The resulting percentages were posted on TAZ maps in 23 increments (Exhibits III and IV) . The influence area for each of the corridors is quite pronounced at the 4% and greater trip use level as shown on the exhibits. The pattern of corridor usage becomes erratic below the 4% level. The determination of the AOB for each of the transportation corridors was based primarily on the above corridor influence areas. However, the following additional criteria were used to supplement the percent of corridor use data to analyze relative benefits: 1UTPS is a battery of sophisticated computer programs developed and sponsored by the Federal Urban Mass Transportation Agency (UMTA) for forecasting travel demand. 2South Orange County Circulation Study (SOCCS) travel demand forecasting model developed by MIA/Transportation Planning Division. 3UROAD is one of the computer programs in UTPS. It is a comprehensive flexible highway assignment and analysis program. -9-