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Design and development of a fiber optic sensor for pavement maintenance applications is reported. The sensor is designed to measure stress distribution inside the sample caused by applied loads on the sample in the range of 0-1000 pounds. Sensor reaction to the temperature variations in the range of 70-90 F is investigated. It can always be assumed that the load is completely transferred from top to the bottom portion of the sample as if the fiber does not exist. A system of optical fiber polarization sensors was developed to measure the stress distribution inside a cylindrical plastic sample exposed to an external load on to its upper surface in axial direction. Sensor outputs corresponding to different levels inside the sample at 70-90 F were obtained. Experiments shows that stress due to applied load decreases from top to bottom. Temperature has effects on properties of both the fiber and the sample material. When temperature is raised from 70 F to 90 F a 10 % absolute difference in the results is observed, knowing that the polarization rotation is proportional to the force along a line (contour). By placing different sensors at different locations and levels of the pavement, its behavior at different times can be monitored and recorded.