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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-
