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Abstract
Research shows that there should be a longer change interval in inclement weather. However, there is limited knowledge on creating a longer change interval. This capstone report aims to provide insight into vehicles’ speed and deceleration rates during inclement weather and recommend future studies. A radar gun was used to capture data on vehicles to understand how vehicle speed and deceleration rates differ in inclement weather. These data were captured on the southbound approach of the intersection of STH 100 [N. Mayfair Road] and W. Wisconsin Avenue in Wauwatosa, Wisconsin. Since there was a lack of inclement weather during the data collection of this capstone report, there was a limited amount of data. From the data that were collected, it can be concluded that vehicles drive slower than the posted speed and decelerate at a significantly slower rate during inclement weather. Because of the limited amount of data and known errors in capturing data, more research will need to be done before changes can be made to the timing of the change interval in inclement weather. Future studies utilizing the same concepts from this capstone report at a smaller intersection with more collection days could effectively prove the need for a longer change interval.