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Data were collected and disturbances were measured to determine the effects of physical disturbances by limited access highways on nearby property values. 3 types of analyses were made on the collected data: major-variable analysis, economic analysis, and interview analysis. In the major-variable analysis, relationships and correlations were examined between sound levels and sound level reductions at specific measurement points, and other variables such as sound level perception, present tree diversity, and homeowners' attitudes of buying another house next to the highway. The economic analysis evaluated the effect of highway disturbances and landscape/landforms on property values. The interview analysis was used to evaluate specific complaints or disturbances.
This synthesis will be of interest to highway environmental specialists (particularly those concerned with assessing social and economic impacts), design engineers, planners, utility managers, and others responsible for the planning, design, and implementation of highway-widening improvements. Information is presented on the reasons for highway-widening projects, the nature of the projects, and the methods and practices for application of analytical techniques used to measure the potential or actual impacts of the projects on people and the physical environment. Mitigation measures are also discussed. This report of the Transportation Research Board describes the most recent widening projects as reported by states or other transportation agencies, as well as the most frequently encountered issues in highway widening. Selected examples of widening projects are included, as is some recognition of the need for additional information and research in the areas of social and economic impact measurement.