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cracking, patching, asphalt raveling, and transverse <br />cracking in a given length of roadway. From these <br />observations, the Pavement Surface Condition (PSC) <br />rating is calculated. The rating is a scale of 0 to 100 <br />(Figure 16). <br />Pavement <br />Condition Index <br />+1ery good 80-100 <br />Good 60-80 <br />Fair 40-60 <br />Poor 20-40 <br />Very Poor 0-20 <br />Figure 16 <br />PSC Rating Scale <br />These ratings are used to evaluate treatment <br />strategies, assess overall management of the <br />roadway surface network, and inform future funding <br />needs. <br />As Figure 17 shows, pavement degrades in a non- <br />linear fashion. Once pavement falls into the <br />fair/poor categories, its condition rapidly degrades <br />without maintenance intervention. The cost to bring <br />a road into good condition or maintain it at this level <br />escalates quickly as the roadway degrades. A road in <br />good condition can be maintained with simple <br />patching and sealing, whereas roads in fair condition <br />may require an overlay, and very poor condition <br />roads often require full reconstruction. <br />Excellent TypicalPa�ft"Snr� <br />40% Drop r�7 <br />Good m Quality <br />o� <br />Fair . -------7545oLde <br />----------►. <br />Poor <br />40% Drop ' <br />m Quality ; <br />Very Poor _1295 of life - . <br />10 15 20 25 <br />Years <br />Figure 17 <br />National Standard Deterioration <br />Curve for Pavement <br />In addition to roadways, the other major asset that <br />the County is responsible for is bridges. The state <br />mandates a biannual review of all bridges to <br />determine their condition. The result of this analysis <br />is a rating of bridges to determine the condition of <br />the structure and if they are functionally obsolete or <br />structurally deficient. Of the 268 bridges under the <br />county's jurisdiction, 60 have only timber railing or <br />no railing at all, while several other structures <br />require deck rehabilitation, scour repairs, railing <br />improvements, painting, or structural concrete <br />repairs. <br />ADMINISTRATION AND OPERATIONS <br />Another critical component to keeping the County's <br />transportation system functioning are the public <br />works staff that administer and support the system <br />by responding to emergencies, conducting <br />maintenance activities, administering permits, and <br />providing planning and engineering improvements <br />to the system. <br />OTHER ROADWAY OPERATIONS <br />Other roadway operations include the roadway <br />elements such as traffic control and street lighting <br />that keep the network operating efficiently. There <br />are many other elements of County roads including <br />shoulders, drainage features, walls, guardrail, <br />signage, traffic signals and streetlights. Most of these <br />elements have not had a systematic method of <br />evaluating condition over time, with elements of the <br />421P-ig0 <br />30 <br />