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The Rolla Daily News - Rolla, MO
  • MoDOT releases maps showing conditions of roads, bridges in county

  • With a few exceptions, most state routes and bridges in Phelps County are in good or fair condition, according to the Missouri Department of Transportation (MoDOT).
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  • With a few exceptions, most state routes and bridges in Phelps County are in good or fair condition, according to the Missouri Department of Transportation (MoDOT).
    Last week, The Associated Press received maps from MoDOT showing the current conditions of Missouri’s roads and bridges.
    MoDOT provided The AP after the news organization requested a list of projects and their cost estimates that have been promised to be completed if a transportation sales tax measure is approved by voters Aug. 5.
    The AP shared the maps with its member newspapers last week.
    Below is an an explanation of the ratings.
    Bridge ratings
    A poor rating was given to any bridge that is deficient by the National Bridge Inventory (NBI) standards.
    A good rating is given to any bridge that is condition 7 or above (using the NBI scale of 0-9) and not deficient.
    Fair is any bridge that does not fall into the above two categories.
    Pavement ratings
    MoDOT rates roads as either “good” or “not good.” MoDOT’s decision criteria is based on customer feedback.
    MoDOT uses a combination of the International Roughness Index (IRI) and a visual rating (on a scale of 1-10) to categorize pavements.
    IRI measures pavement roughness in terms of the number of inches per mile that a laser, mounted in a specialized van, jumps as it is driven across a roadway segment. The lower the IRI number, the smoother the pavement is.
    MoDOT divides the state roadway network into three distinct categories: major roads, minor roads and low-volume routes.
    Major roads are roads that are functionally classified as principal arterial – these are the routes that carry the most traffic, currently almost 80 percent of the vehicle miles traveled.
    For major road pavement condition ratings, if the speed limit is 55 mph or greater and the IRI less than 100, then the pavement condition is considered good.
    If the speed limit is less than 55 mph and the IRI is greater than 100 and the visual rating is 7 or greater, then the pavement condition is good.
    Minor roads are roads that are not functionally classified as principal arterial, and low-volume roads are a subset of minor roads. Low-volume roads are minor roads that have an average annual daily traffic of less than 400 vehicles.
    For minor road pavement condition ratings, if the IRI is less than 140, then the pavement is considered good. Also, if the IRI is greater than 140 but less than 170, and the visual rating is 6 or greater, then then pavement condition is rated as good. If the IRI is greater than 170, the pavement condition is considered not good.
    For low-volume road pavement condition ratings, if the IRI is less than 170, then the pavement is considered good. Also, if the IRI is greater than 170 but less than 220, and the visual rating is 6 or greater, then then pavement condition is rated as good. If the IRI is greater than 170, the pavement condition is considered not good.
    Page 2 of 2 - At The AP’s request for a further categorization of the “not good” pavement, MoDOT applied a new criteria to further categorize the “not good” pavements into “fair” or “poor” conditions.
    These two new categories really have no connection to any condition reporting MoDOT does on an ongoing basis, other than the fact that the two together make up the “not good” rating.
    For the purposes of these maps, MoDOT show “good” as all of the routes that meet its criteria of “good.”  
    The “fair” category are routes that do not meet our criteria for “good,” but have a visual rating condition of 7 or better for major roads and a rating of 6 or better for minor roads.
    The “poor” category are routes that did not meet any of the above criteria.
    According to the map provided by MoDOT, routes rated as poor in Phelps County include the far western section of Interstate 44 near the Pulaski County line, A section of Route K in the southwestern part of the county near the Pulaski County line, Route RA north of I-44 between St. James and Rolla, Route NN, off Route 68 near the Crawford County line and several sections of Route O south of Rolla to the Dent County line.
    Most of I-44 in the county was rated in the fair category except near the exits to St. James, Rolla and Doolittle. The northern section of Route T in the county also fell in the fair category as did most of Routes Y and U.
    Routes 72 and 68, for the most part, were rated as good as was a majority of Route 63.

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