Developed by the Texas Transportation Institute and the Texas Department of Transportation



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2.8 Fuel Efficiency Variables
Projections of fuel economy, along with projections of the future population, are key elements of projecting future revenues. In late 2006, TxDOT contracted with Cambridge Systematics to forecast future levels of fuel efficiency for personal and commercial vehicles. The Cambridge Systematics analysis included alternative assumptions regarding the adoption of alternative fuel vehicles. This analysis was then adjusted to account for the proportional contribution to total vehicle miles traveled of each vehicle type in Texas. Low, medium and high fuel efficiency scenarios were produced. These alternative fuel efficiency scenarios are presented below. (See appendix for criteria used in this model to differentiate between personal and commercial vehicles).

The TRENDS model allows the user to enter the assumption regarding fuel efficiency for both personal and commercial vehicles to be used in calculating the amount of fuel used and, in turn, the amount of fuel tax revenues derived from the fuel that is consumed. The fuel efficiency option is selected under the heading “Fuel Efficiency Variables”. The default selection is the “Average” scenario. (see below)





2.9 Fund 006 Allocations to other Agencies
Several allocations are made from Fund 006 (“The Highway Fund”) to other state agencies. Over the years, as the State has sought new sources of general revenue, the number of agencies who receive transfers from Fund 006 has grown. Currently, agencies who receive revenues from Fund 006 include the Texas Department of Public Safety, the Office of the Attorney General, State Health and Human Services Commission, the Texas Department of Corrections and others. These expenditures account for 13.8 percent of total outflow from Fund 006.1 (Click here for more information regarding Fund 6 allocation.)
Therefore, this section asks if you wish to eliminate some or all of the fund 006 allocations to other state agencies. The default answer for this question is “No”. If you would like to eliminate some or all of the fund 006 allocations to other agencies, change the answer to “Yes”. Once the answer is changed to “Yes”, a new set of options appear. (see below)

You are first asked to enter the percent of fund 006 allocations to other agencies that you wish to be eliminated. Next, you are asked to enter in the year in which you want fund 006 allocations to other agencies to be eliminated. Note that model will not allow you to enter any year greater than 2035.


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