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Evaluation and Validation of High-Speed Multi-Function System for Automated Pavement Condition Survey

The Florida Department of Transportation (FDOT) has developed and validated a multi-functional survey vehicle (MPSV) for rapid and automated collection of pavement condition data using its imaging subsystem and identification of hazardous conditions using its inertial subsystem. During the first phase of the study, an efficient technique was developed to filter out noise present in the pavement crack images, by using intensity measurements obtained from a standard grayscale target. The results from the initial phases of the study can be used to (1) minimize the effect of noise on digital images of pavement cracks, (2) improve the accuracy of evaluation of pavement cracks based on digital images, and (3) determine the optimum conditions for most accurate crack evaluation. The inertial measurement unit (IMU) subsystem of the MPSV also plays a vital role because of its capability for rapid and automatic collection of roadway geometrical data such as cross-slopes, curvatures and grades. It was also seen that the cross-slope data acquired by the IMU subsystem of the MPSV were generally repeatable and accurate on asphalt pavements, with respect to American Society for Testing and Materials (ASTM) standards. Hence the investigators believe that the MPSV is well-equipped for statewide implementation of automated cross-slope and super-elevation measurements. Furthermore, the investigators also recommend that the MPSV is adequate for automated project-level evaluation of roadway curvature.