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Taiwan has started its Stage 1 motorcycle emission regulations since 1988, and will step into Stage 5 emission standards in 2007. The Taiwan Environmental Protection Administration (TEPA) not only tightened up emission standards stage by stage, but also took measures to check emission compliance of motorcycles during the useful life. Especially, the measures concerning the emission control for in-use motorcycles such as the annual inspection and maintenance (I/M) program and the roadside idle emission tests, are unique in the world and effective for the air quality control. By way of emission control measures for new and in-use motorcycles, Taiwan has constructed a life-cycle emission control for motorcycles.

Since the exhaust emissions of an in-use motorcycle usually increases along its age, the Taiwan Environmental Protection Administration (TEPA) started to adopt useful life and deterioration factors requirements for the emission type approval certification in 1991. Considering the actual travel mileages for most motorcycles in Taiwan, it is necessary to extend the useful life period and mileage requirements for the future emission standards. This change of requirement will increase certification time and costs of new models for manufacturers. To evaluate the feasibility of shortening the accumulated useful life mileage for the regulatory durability test requirement; this study surveyed 105 sets of durability test results to explore the effects of deterioration factors on durability test result calculations.