Automated Vertical Clearance Measurement During Photolog Operations
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2000-09-01
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Abstract:The Connecticut Department of Transportation uses two digital-based photolog vans to collect four different sets of roadway images as well as 40 different types of alphanumeric data, including vertical cross slope and horizontal geometry. A request for overhead clearance information from Department personnel involved with the permitting of oversize/overweight vehicles, and the discovery of a prototype device developed by the Federal Highway Administration, prompted a proposal to incorporate this type of data collection into the existing photolog activities. The objectives of the study are: to determine if the device developed by FHWA is reliable and accurate enough to determine vertical clearances under overhead objects; to develop a multi-laser device with three sensors instead of one and test such a device to determine if it can be used to simultaneously measure three locations accurately on an overhead object; and, draft a technical specification for the integration of such a device into the existing Department data collection vehicles. This report summarizes the testing of the prototype device, the assembly and use of a new device, and the results of limited field testing. Data for several bridges and cantilevered overhead sign structures are presented. Observations are made as to the comparison of the data to clearance diagrams created by bridge safety inspectors. Conclusions based on these observations are presented and recommendations are made for further study. 6 Tables, 3 figures, appendix. 29 p.
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