The robust bridge system for highways and/ or roads is a key component to the well-being of people as well as the economic development of Japan. In recent years, however, we have been subjected to the effects of an aging and deteriorating the bridge system combining with the lack of funding for its maintenance. Therefore, the development of risk-based maintenance methodology is one of urgent issues. In this paper author presents UK's risk-based methodologies for prioritizing bridge maintenance works, which provide support for developing the Japanese specific method in this field.

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 It is important not only for safety but also for decreasing track maintenances to suppress large dynamic wheel load. In this paper, effectiveness of the previous countermeasures for large wheel load in Tokaido-Shinkansen is reviewed first, and it is shown that the existing issue is maintenance of shortwave longitu dinal irregularities. Measuring method of asymmetry chord offset which is adopted for the latest inspection car has better accuracy in such wave lengths.
 We explain that wheel load can be estimated from curvature of longitudinal level of track shape by analysis of full-scale experiment. Then, accuracy of the estimation is verified by numerical simulations and actual measurements. From those results, a new track maintenance method of shortwave length to suppress wheel load variation is proposed. Finally, its usefulness is discussed.

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 In the application of CM/GC contract in United States, reduction of design error and additional design work, grabbing of cost in early stage and partial start of construction work are designated by supplying advice regarding design, construction period and cost to the Owner. In addition there is a merit that the separation of contract for construction and for design makes it easier to reflect the owner's intention to the project.
 In this paper, in reference to the content of US research visit in November 2013 and the current situation of private civil works, the consideration for the problem and solutions for application of CM/GC contract to public civil works are reported.

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