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Pavement management is the process of planning the maintenance and repair of a network of roadways or other paved facilities in order to optimize pavement conditions over the entire network. It is also applied to airport runways and ocean freight terminals. In effect, every highway superintendent does pavement management.〔Pavement Management - A Manual for Communities, U. S. Department of Transportation, Metropolitan Area Planning Council, Boston MA., 1986〕 Pavement management incorporates life cycle costs into a more systematic approach to minor and major road maintenance and reconstruction projects. The needs of the entire network as well as budget projections are considered before projects are executed.〔Pavement Management for Airport, Roads, and Parking Lots, 2nd Edition, M.Y. Shahin, Springer Science+Business Media, LLC, 2002〕 Pavement management encompasses the many aspects and tasks needed to maintain a quality pavement inventory, and ensure that the overall condition of the road network can be sustained at desired levels.〔Hillsborough County Pavement Management Strategy, Hillsborough County Fl, Ch.1 - Introduction, pg1., R. Cox, P.E. 2006〕 The introduction of the Governmental Accounting Standards Board’s (GASB’s) Statement 34〔(GASB Welcome Page )〕 is having a dramatic impact on the financial reporting requirements of state and local governments. Introduced in June 1999, this provision recommends that governmental agencies report the value of their infrastructure assets in their financial statements. GASB recommends that government agencies use a historical cost approach for capitalizing long-lived capital assets; however, if historical information is not available, guidance is provided for an alternate approach based on the current replacement cost of the assets. A method of representing the costs associated with the use of the assets must also be selected, and two methods are allowed by GASB. One approach is to depreciate the assets over time. The modified approach, on the other hand, provides an agency more flexibility in reporting the value of its assets based upon the use of a systematic, defensible approach that accounts for the preservation of the asset.〔Proceedings of the 2003 Mid-Continent Transportation Research Symposium, Ames, Iowa, August 2003. © 2003 by Iowa State University.〕 Pavement management and pavement management systems provide agencies with the tools necessary to evaluate their pavement assets and meet the GASB34 requirements under the modified depreciation approach. ==Pavement management systems== A pavement management system (PMS) is a planning tool used to aid pavement management decisions. PMS software programs model future pavement deterioration due to traffic and weather, and recommend maintenance and repairs to the road's pavement based on the type and age of the pavement and various measures of existing pavement quality. Measurements can be made by persons on the ground, visually from a moving vehicle, or using automated sensors mounted to a vehicle. PMS software often helps the user create composite pavement quality rankings based on pavement quality measures on roads or road sections. Recommendations are usually biased towards preventive maintenance, rather than allowing a road to deteriorate until it needs more extensive reconstruction. Typical tasks performed by pavement management systems include: # Inventory pavement conditions, identifying good, fair and poor pavements. # Assign importance ratings for road segments, based on traffic volumes, road functional class, and community demand. # Schedule maintenance of good roads to keep them in good condition.〔'Saha, P., & Ksaibati, K. (2015). 'A Risk-based Optimization Methodology for Managing County Paved Roads', In Transportation Research Board 94th Annual Meeting (No. 15-1916), http://docs.trb.org/prp/15-1916.pdf〕 # Schedule repairs of poor and fair pavements as remaining available funding allows.〔''Pavement Management System Summer Intern Program'', Nuggets and Nibbles Volume XXX Number 3, Cornell Local Roads Program, Summer 2011, page 4, http://www.clrp.cornell.edu/nuggets_and_nibbles/index.htm〕 Research has shown that it is far less expensive to keep a road in good condition than it is to repair it once it has deteriorated. This is why pavement management systems place the priority on preventive maintenance of roads in good condition, rather than reconstructing roads in poor condition. In terms of lifetime cost and long term pavement conditions, this will result in better system performance. Agencies that concentrate on restoring their bad roads often find that by the time they've repaired them all, the roads that were in good condition have deteriorated.〔(【引用サイトリンク】publisher= Federal Highway Administration, U.S Department of Transportation )〕 The State of California was among the first to adopt a (PMS) in 1979. Like others of its era, the first PMS was based in a mainframe computer and contained provisions for an extensive database.〔U.S. Department of Transportation Federal Highway Administration, California Division, November 13, 2003)〕 It can be used to determine long-term maintenance funding requirements and to examine the consequences on network condition if insufficient funding is available. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pavement management」の詳細全文を読む スポンサード リンク
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