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48 FIGURE 22 Main menu for the ODOT pavement data quality assurance software (52). railroad crossings and bridges, and nonmatching dis- Data Collection Practices tress types (e.g., an asphalt concrete distress assigned to a concrete pavement). At the network level, the survey includes surface distress, rut- ting, and smoothness (in addition to crack sealing, patching ODOT has found that these checks provide a wealth of rating, and right-of-way pictures), which the Ministry believes information that has been helpful for evaluating the data pro- provides sufficiently accurate and consistent information for vided by the data collection service provider. The software network-level analyses. The surveys are conducted by service also provides a useful interface for accessing and changing providers using automated road testing vehicles. the data in the database. The project-level surveys consist of manual surface dis- tress surveys conducted during the detailed evaluations that Use of Geographic Information System in are carried out for candidate rehabilitation projects. In addi- Quality Acceptance Checks tion to distress surveys, this evaluation can include geo- technical investigations, strength testing, coring, and labora- ODOT has recently begun using GIS for complementing the tory testing. The distresses are evaluated every 20 m and agency's quality acceptance procedures. The visualization and plotted on a map. spatial analysis tools available in GIS can be very useful for detecting missing sections, inconsistencies in the location of The quality acceptance procedures consist of three levels some sections, and unexpected changes in pavement condition. of testing: (1) initial tests completed by the service provider before the surveys, (2) blind site monitoring during the production surveys, and (3) final assessment of the submitted BRITISH COLUMBIA data files. The British Columbia Ministry of Transportation's (BCMoT) Pavement Surface Condition Rating Manual (99) originally Initial Quality Acceptance Tests released in 1994 and updated in 2002 includes a detailed quality assurance section. The Manual's rating methodology The initial tests verify the service providers' application of was designed to be applicable to both automated and manual the BCMoT rating system and the operation of the smooth- surveys so that it can be used for network- and project-level ness and transverse profile instrumentation. The service analysis. The surveys and data post-processing are guided by provider is required to pass all checks before starting pro- quality management procedures to ensure that the data are duction data collection. The agency selects four 500-m-long collected accurately and repeatedly from year to year. test sites that exhibit a variety of distress types, range in pave-