Description

The total road costs are calculated by adding both the annual residential and nonresidential vehicle miles traveled (VMT) to gauge the annual vehicle miles traveled. This is then apportioned among the jurisdictions using percent VMT on jurisdiction roads to assess the annual VMT by place. The cost of roads is then calculated using capacity per lane, cost per lane-mile, and right-of-way costs as percent of road costs to get the annual capital costs of roads. From this figure, the cumulative capital costs of roads can be estimated. There is also a sliding bar at the top of the graphic to change the level-of-service for roads. The default level-of-service standard used in the simulation is D, which equals 8,500 trips/lane.

Assumptions Used

• Percent VMT on Jurisdiction Roads
  

• Capacity per Lane = 8,500 trips/lane (Level-of-Service D)

• Cost per Lane-Mile = $2,238,369
  Source: Roadway Cost Per Centerline Mile (Revised November 2005) from Hillsborough County.
  
  Notes: $2,238,369 is the cost per lane-mile of 14 urban road projects cited in the 2004 Duncan report. Values were adjusted for the full cost of road widening by dividing individual project costs by the number of additional lane-miles that the project created.
  
  The Duncan report computed a $1,216,867 per lane-mile cost "by dividing the total improvement cost by the total number of lane-miles of the improved roadway, rather than by the new lane-miles added by the improvement." The report states: "The County has elected to be conservative on this issue, and to essentially charge only half the cost of a two-lane to four-lane improvement to growth. . . The conservative approach used by Hillsborough County is less common in Florida than the alternative” [Phase IV, p. 19].
  
  By assuming a cost of $2,238,369 per lane-mile, the FIELD Model uses the more common approach. In addition, MPO staff indicated that all new roads and road expansions in Hillsborough County are built to urban standards and at urban costs, so the FIELD Model makes no allowance for accommodating new VMT using rural roads.
  
  Recent cost estimates derived from the Florida Department of Transportation's Long Range Estimating (FDOT's LRE) system in November, 2005, were adopted by Hillsborough County transportation planners in December 2005. These estimates indicate that $7,105,382 is the cost per lane-mile based on the average of:
  
  $13,669,274 for adding 2 lanes (to existing 2 lanes) with 5' sidewalk, and curb & gutter (includes milling and resurfacing existing pavement), and
  
  $14,752,256 for adding 2 lanes (to existing 4 lanes) with 5' sidewalk, and curb & gutter (includes milling and resurfacing existing pavement).
  
  These two project types are typical of the most common road projects for the County. These estimates do not include many extra costs for signals, bridges, bicycle facilities, stormwater retention, and cross street improvements. However, these cost estimates do include a 25 percent add-on for contingencies.
  
  Given atypically high labor and material costs due to recent hurricane damage and FDOT's tendency to overestimate costs and avoid overruns, it may be reasonable to exclude the contingency cost factor, which reduces the cost per lane-mile estimate to $5,637,328.
  
  Notes from these estimates include the following:
  1) Estimates were derived from FDOT LRE System.
  2) These figures exclude costs for intersections/interchanges, improvements to cross streets, bridges over 20', right-of-way, landscaping, ITS and traffic signals.
  3) The figures are based on market costs for Hillsborough County.
  4) Costs shown are present day costs.
  5) The costs developed for this report are not project-specific and should be used for preliminary estimating purposes only.

• Right-of-Way Costs as Percent of Roads = 1.0
  Source: Florida Department of Transportation
  
  Notes: Florida Department of Transportation (FDOT) is currently estimating right-of-way costs at 100% of construction costs. This factor was recommended for use in the 2025 Long Range Transportation Plan (LRTP) in a memo from Hillsborough County Public Works to the Metropolitan Planning Organization (MPO) on December 19, 2005. This recognition of rapidly rising land costs replaces the 41.3 percent factor used in the 2004 Duncan report.
  
  

Equations Used/Variables Used

• Annual Residential Vehicle Miles Traveled = Annual Employment Change x Nonresidential Trip Rates x Percent New Nonresidential Trips x Trip Ends Adjustment x Nonresidential Trip Lengths x Development Pattern

• Annual Vehicle Miles Traveled = ARRSUM (Annual Residential Vehicle Miles Traveled) + ARRSUM (Annual Nonresidential Vehicle Miles Traveled)

• Annual VMT BY Place = Annual Vehicle Miles Traveled x Percent VMT on Jurisdiction Roads

• Annual Capital Costs of Roads = (Annual VMT by Place / Capacity per Lane) x Cost per Lane-Mile) x (1 + Right-of-Way Costs as Percent of Road Costs)