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might visually inspect all signs covered by this policy once each year; visually <br />inspect one-half of all signs covered by this policy in even numbered years and <br />visually inspect the other one-half of its signs in odd numbered years; visually <br />inspect all signs on high volume roads once per year and visually inspect signs on <br />all other roads once every three years.] <br />Measured Sign Retroreflectivity. Sign retroreflectivity is measured using a <br />retroreflectometer. Signs with retroreflectivity below the minimum levels will be replaced. <br />The City will measure sign retroreflectivity based on the following schedule: <br />ZExpected Sign Life. The installation date is labeled or recorded when a sign is installed, <br />so that the age of any given sign is known. The age of the sign is compared to the expected <br />sign life. The expected sign life is based on the experience of sign retroreflectivity <br />degradation in the City. Signs older than the expected life will be replaced. <br />Blanket Replacement. All signs in the City of a given type are replaced at specified <br />intervals. This eliminates the need to assess retroreflectivity or track the life of individual <br />signs. The replacement interval is based on the expected sign life for the shortest-life <br />material used in the City or a given sign type. The current replacement interval is <br />years. <br />Control Signs. Replacement of signs in the City is based on the performance of a <br />sample set of signs. The control signs will be a small sample located in the City's <br />maintenance yard or a selection of signs in the field. The control signs will be monitored to <br />determine the end of retroreflective life for the associated signs. All signs represented by a <br />specific set of control signs will be replaced before the retroreflectivity levels of the control <br />signs reach the minimum retroreflectivity levels. <br />Article VII. Sign Replacement <br />The City hereby establishes the following priority order in which road signs will be replaced: <br />First priority shall be given to replacing all signs determined not to meet applicable <br />retroreflectivity standards. Top priority shall also be given to replacing missing or <br />damaged signs determined to be of a priority for safety purposes. <br />Second priority shall be given to signs determined to be marginal in their retroreflectivity <br />evaluation. <br />Third priority shall be given to all remaining signs as they come to the end of their <br />anticipated service life, become damaged, etc. <br />In addition, within each category above, further priority shall be given to warning and regulatory <br />signs on roads with higher vehicle usage. <br />After the initial replacement of signs as provided for in this Article or the installation of new <br />signs, the City shall, for the purpose of complying with the requirements of the MN MUTCD, <br />maintain minimum retroreflectivity standards, as budgetary factors allow, by replacing signs as <br />they reach the end of the latter of their (a) warranty period; (b) expected life expectancy for the