highway system scdot ?· evaluation of the conditionof the state’s interstate system and bridge...

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  • 2015

    SCDOT Maintenance Division SCDOT

    1/1/2015

    SCDOT Maintenance Assessment Program Annual Report

    Maintenance Assessment & Funding Needs for the

    South Carolina State Primary and Secondary

    Highway System

  • 1

    South Carolina Department Of Transportation Maintenance Assessment Program (MAP) Report (2).docx

    Table of Contents

    Executive Summary ................................................................................................................................................ 2 Background: ............................................................................................................................................................ 3 Description: ............................................................................................................................................................. 3 Evaluation ............................................................................................................................................................... 6

    Level of Service .................................................................................................................................................. 6 Results ..................................................................................................................................................................... 7 System Needs ........................................................................................................................................................ 14

    Growth Population and DVMT ..................................................................................................................... 14 Funding Needs ...................................................................................................................................................... 16

    MAP Projection ................................................................................................................................................ 16 Pavement Management Program Projection ..................................................................................................... 22 Resurfacing Projection ...................................................................................................................................... 27

    Backlog Cost ......................................................................................................................................................... 28 Minimum Acceptable Levels of Service ............................................................................................................... 28 Summary and Conclusions ................................................................................................................................... 28 Addendum ............................................................................................................................................................. 30

    Appendix A ....................................................................................................................................................... 31 Appendix B ....................................................................................................................................................... 32 Appendix C ....................................................................................................................................................... 33

  • 2

    South Carolina Department Of Transportation Maintenance Assessment Program (MAP) Report (2).docx

    Executive Summary

    In order to identify the current level of service being provided and estimate the amount of work necessary to

    accomplish a specific level of service, the South Carolina Department of Transportation has surveyed and

    evaluated the condition of the states primary and secondary highway system. The purpose of this report is

    to provide the results of this evaluation and the associated estimates. In this report, funding estimates are

    calculated to obtain a specific level of service for selected activities. To provide a comparison, several

    different methods are used to estimate the necessary funding needs to obtain each level of service. These

    estimates do not include all activities and do not include overhead costs.

    South Carolina has the fourth largest highway system in the nation, consisting of approximately 41,421

    miles of roadway. Compounding the challenges of managing such a large transportation system is the

    increasing rate of deterioration. This rate of deterioration is likely due to rapid population growth in our

    state. Growth and population data released by the Census Bureau in July of 2014 identified South Carolina

    as one of the top 10 states for percentage of population growth. Along with that population growth comes

    the likelihood of a future increase in daily vehicle miles traveled (DVMT). This increase in wear and tear

    along with associated construction traffic is, and will continue, taking a costly toll on our roadways.

    It is apparent that the state legislature is aware of the transportation funding needs in South Carolina. Act

    176, which dedicates a relatively small amount of the General Fund to the resurfacing of state non-federal

    aid secondary roads, was passed several years ago. Additionally, just last year, Act 98 was passed by the

    legislature to dedicate even more state funds to the transportation system. This act generated an additional

    $41 million for the fiscal year 2013-2014. The combined general fund contribution from these two acts has

    resulted in a total of $79.8 million additional funds this fiscal year. However, as this report illustrates, to

    attain an acceptable level of service, additional funding is necessary. The primary funding source for our

    state transportation system is the motor fuel user fee, or gas tax. Since 1987 this fee has remained steady at

    only 16 cents per gallon. Its important to note that in 1987 gas was less than $1.00 per gallon. With no

    increase in twenty five years, it is no surprise that South Carolinas gas tax is one of the lowest in the nation.

    The aging transportation system coupled with a stagnant funding source does not provide a bright future for

    the infrastructure of our state.

  • 3

    South Carolina Department Of Transportation Maintenance Assessment Program (MAP) Report (2).docx

    Background:

    The Maintenance Assessment Program (MAP) was developed in response to a need for an objective method

    of analyzing and measuring the performance of the South Carolina Department of Transportations

    (SCDOT) maintenance division. One goal of the program was to determine the level of service that is being

    provided to South Carolinas motorists. This would also allow a calculation of the amount of improvement

    that would be required to obtain higher levels of service, and the associated cost of these improvements.

    Another benefit of this program is that a consistent expectation of performance has been established for the

    entire state. Areas that need improvement have been identified and available resources can be directed to

    these areas. In some cases, improvement plans and programs have been developed in an effort to improve

    the performance.

    Description:

    The MAP is a random statistical evaluation of the South Carolina Department of Transportations (SCDOT)

    maintenance performance on the system of primary and secondary highways throughout the state. Seven

    key elements of maintenance were identified for evaluation. Significant indicators were chosen for each of

    the seven key evaluated elements. Sections of roadway, two-tenths of a mile in length, are randomly

    selected throughout the state. A two-person inspection team physically evaluates the seven key elements on

    randomly selected roadway segments. These evaluations are scheduled throughout the year to ensure that

    they are performed in all seasons. This is done to alleviate any seasonal variances in the key elements

    evaluation results.

    The seven elements that were evaluated are: (1) Pavement, (2) Shoulders / Ditches, (3) Drainage Structures,

    (4) Roadside, (5) Signs, (6) Pavement Markings, and (7) Guardrail. Each element is evaluated and the

    condition is recorded in a database. The elements and their condition indicators are located in Table 1. An

    evaluation of the condition of the states interstate system and bridge system were not included in the MAP

    evaluations. The bridge maintenance division has a separate program for evaluating the condition and needs

    of the states bridges. A MAP evaluation of the interstate system is not performed due to concerns for the

    safety of the raters and motorists, and the ensuing traffic congestion. While not included in the MAP

  • 4

    South Carolina Department Of Transportation Maintenance Assessment Program (MAP) Report (2).docx

    evaluation, the costs for maintaining specific levels of service can be estimated for these assets. These costs

    are included in this report.

    For both primary and secondary highway systems, a statistical sampling was made to determine the location

    of sites to be surveyed. Statewide, 2,721 sites were randomly selected for inspection. This equates to

    approximately 1.3% of the total inventory and a statistical margin of error of plus or minus 10 % (assuming

    every randomly selected segment contains all items/elements evaluated). During th

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