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Taiwan national No.1 and No.3 freeway project have opened to traffic. Taipei-Ilan expressway project, Nantou section, national No. 6 project are under construction now. Due to properties of these projects are multi-millions dollars size, super long alignment, complication of territory and geology factors, and difficulty of construction, the adequate scope definition of each construction lot of projects is necessary to complete projects smoothly. The study of scope definition of bided freeway construction projects acquires experience and rules which can be applied to the future projects of Taiwan closed-linked freeway. In general, the freeway project composes 6 categories of works listed as: road, bridge, tunnel, architecture, facility, and auxiliary. With large number activities and profession oriented, each category may mutually affect each other. If the combination of categories in one lot is not arranged well, it could damage the goal of project completion on time. After analyzing properties of different categories, the decision making factors and weight of each factor for construction lots scope definition can be introduced. To realize the strategy for the lot scope definition and advantage and disadvantage of different strategies, the study reviews wide ranges of relative references, interviews person who participated in the core works of lots scope definition and contract administrators of construction period. Finally, the factors can be generated by considering work category, properties of the project, and construction experience. In addition, the weight of each factor is evaluated. The factors include earth work balance, profession oriented, small firms cultivated, interface minimization, administration style of owner, requirement to open to traffic partially, capacity of construction firms, tendering style, and consideration of society environment. Separately, work for bridge, tunnel, E&M, illumination, and system integration is considered as an independent professional lot. Balance of earth work is the primary factor for a road work construction lot. Small size and located in isolated area, the project is designated to take care of small firms. In order to minimize interfaces and maintain certain size of project, the acceptation of complicated and huge categories as a single lot is reasonable.
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