Because it is essential that MoDOT take care of the more than 32,000 miles of highway on the state system, rehabilitation and reconstruction of the existing roads is a priority. Missourians agree; five times more Missourians chose fixing the existing system as their top priority than chose building new roads. In general, rehabilitation and reconstruction activities are contracted and might include pavement resurfacing and bridge and pavement replacement. It might also include work that allows a roadway to meet desired standards, such as the addition of shoulders or minor pavement or bridge widening. It does not include activities that fundamentally change a facility, like the addition of lanes. Even working with the most optimistic projections, MoDOT probably never would have the resources to achieve 100 percent of the desired conditions established for rehabilitation and reconstruction of pavement and bridges. Establishing priorities that move toward meeting these expectations is a more reasonable approach. After priorities are established, associated goals and costs must be developed. The National Highway System, which includes the interstate system and other major highways, will be MoDOT's first priority. This system represents only 13 percent of the mileage, but carries more than 62 percent of the traffic. Currently anticipated funding will not allow MoDOT to achieve and maintain this system at 100 percent of the desired pavement condition. Even if funds were available, achieving this would be extremely difficult. MoDOT will first take steps to stop the rate of deterioration on the system, then reach and maintain a goal of 80 percent of the system at the desired condition level. Table 7 Highway Rehabilitation and Reconstruction Goals - NHS (millions of dollars) Attribute Desired Result Mileage Meeting Desired Result *        Current       80% Target Cost to Achieve Desired Result (2000 dollars) Pavement PSR*** greater than or equal to 32 1,780 (42%) 3,389 $ 2,544 Lane Width** 12' travel lane 3,837 (90%) 0 Shoulder 10' hard surface 2,013 (48%) no goal established 103 Total $2,647 * Centerline miles - miles of highway measured down the centerline. Centerline miles do not measure actual miles of pavement. For example, one centerline mile of a two-lane road would equal two miles of pavement. ** Lane width already exceeds 80 percent goal *** Pavement serviceability rating - the smoothness and pavement distress of a road segment with 40 representing new pavement. The remaining arterials make up another 15 percent of the mileage and carry 20 percent of the traffic in the state. Because the arterial system carries a relatively small percentage of the statewide traffic volume, MoDOT must adjust its investment in these routes accordingly. Establishing a goal to meet 75 percent of the desired conditions on the remaining arterials will result in more than twice the miles of good pavement on this system while allowing MoDOT to use the majority of its funds to address needs on the NHS. Table 8 Highway Rehabilitation and Reconstruction Goals - Remaining Arterials (millions of dollars) Attribute Desired Result Mileage Meeting Desired Result * 75% Target Cost to Achieve Desired Result (2000 dollars) Pavement PSR** greater than or equal to 31 1,497 (31%) 3,621 $ 1,626 Lane Width 12' travel lane 2,165 (45%) no goal established 126 Shoulder 8' - 10' hard surface 1,062 (22%) no goal established 222 Total   $1,974 * Centerline miles - Centerline miles do not measure actual miles of pavement. For example, one centerline mile of a two-lane road would equal two miles of pavement. ** Pavement serviceability rating - the smoothness and pavement distress of a road segment with 40 representing new pavement. The collector system, with 72 percent of the miles, carries 18 percent of the traffic in the state. Shoulder and lane width improvements account for nearly 75 percent of the total collector system needs. However, using the same principles applied to address needs on the arterial system, it is more practical for MoDOT to target its investments at rehabilitation and reconstruction and improvements needed to ensure safety on the collector routes. Maintaining the road surfaces will protect MoDOT's investment. Targeting roads where traffic volumes exceed 1,700 vehicles per day will benefit the most users. Table 9 Highway Rehabilitation and Reconstruction Goals - Collectors (millions of dollars) Attribute Desired Result Mileage Meeting Desired Result        Current 70% Target Cost to Achieve Desired Result (2000 dollars ) Pavement PSR***** greater than or equal to 30 15,336 (66%) 16,266 $983** Lane Width*** 12' travel lane     853   (4%) no goal established     215 Shoulder**** 2' - 8' aggregate surface 12,446 (54%) no goal established     175 Total   $1,373 * centerline miles - miles of highway measured down the centerline. Centerline miles do not measure actual miles of pavement. For example, one centerline mile of a two-lane road would equal two miles of pavement. ** pavement cost based on average of $50 million per year for 10 year overlay cycle. *** shoulder width estimates based on assumption that improvements made on routes with > 1,700 average annual daily traffic count. **** lane width estimate based on assumption that 10 percent of total goal would be set aside for lane width improvements. ***** Pavement serviceability rating - the smoothness and pavement distress of a road segment with 40 representing new pavement. The elimination of all bridges where condition ratings fall below 5 (on a scale from 1 - 9) cannot be achieved using existing funding. Cost estimates for bridges were categorized based on the corresponding roadway system (NHS, remaining arterials and collectors.) It is reasonable to set the same goals for bridges of 80 percent at a desired condition rating of 5 on the NHS and 75 percent at a desired condition rating of 5 on remaining arterials and collectors. The higher standard for collector system bridges is appropriate to ensure continued safety of the traveling public. Once a bridge falls below condition 3, it must be closed. Tables 10-12 illustrate the rehabilitation and reconstruction targets for the various parts of the bridge system. Table 10 Bridge Rehabilitation and Reconstruction Goals - NHS (millions of dollars) Attribute Desired Result Number of Bridges that Meet Desired Result Currently 80% Target Cost to Achieve Desired Result (2000 dollars) Single-Condition Rating, Posted Load, width restricted and vertical clearance Greater than or equal to 5, legal load limit, approach roadway width, legal vertical minimum 1,823 2,322 $1,583 Total $1,583 Table 11 Bridge Rehabilitation and Reconstruction Goals - Remaining Arterials (millions of dollars) Attribute Desired Result Number of Bridges that Meet Desired Result Currently 75% Target Cost to Achieve Desired Result (2000 dollars) Single-Condition Rating, Posted Load, width restricted and vertical clearance Greater than or equal to 5, legal load limit, approach roadway width, legal vertical minimum 758 1,133 $ 915 Total $915 * Divided facilities with only two lanes of traffic in each direction will be considered adequate if the median shoulders are four feet or more.   Table 12 Bridge Rehabilitation/Reconstruction Goals - Collectors (millions of dollars) Attribute Desired Result Number of Bridges that Meet Desired Result Currently 75% Target Cost to Achieve Desired Result (2000 dollars) Single-Condition Rating, Posted Load, width restricted and vertical clearance Greater than or equal to 5, legal load limit, approach roadway width, legal vertical minimum 1,609 4,133 $3,379 Total $3,379 * Divided facilities with two lanes of traffic in each direction will be considered adequate if the median shoulders are four feet or more.