Inertial Profiler Certification for Evaluation of International Roughness Index (2018) / Chapter Skim
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Pages 73-85
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From page 73... ...
73 This chapter presents the results obtained from the survey regarding the procedures followed by the state DOTs to collect network-level profile data, including whether the state DOT or a vendor collects the data; certification of profilers and operators; operational procedures for collecting the data; and data quality management. Responses received from 44 states that responded to the survey are presented in this section.
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From page 74... ...
74 Inertial Profiler Certification for Evaluation of International Roughness Index • In one state, the state DOT only collects data on the state highway network and does not collect data at the HPMS sections on the off-state system. • In 27 states (61% of the states that responded to the survey)
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Collection of Inertial Profile for Network-Level IRI 75 certified by an out-of-state university at a facility that is not subjected to traffic. This certification is performed at TTI.
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76 Inertial Profiler Certification for Evaluation of International Roughness Index both the DOT and vendor-owned equipment are certified. In five of these states, only the vendor collects the network data, while in another five of these states only the DOT collects network data.
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Collection of Inertial Profile for Network-Level IRI 77 Fee for Certifying Vendor-Owned Profilers Although vendors collect data in 25 of the 44 states that responded to the survey, vendorowned profilers are certified in only seven states. A fee for certification of equipment is charged in three of these states.
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78 Inertial Profiler Certification for Evaluation of International Roughness Index collected by the state DOT–owned profiler at the sites, or (2) collecting data with the vendor's equipment at established verification sites where data have been collected previously with a profiler and then comparing the collected data with historical data collected at the sites.
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Collection of Inertial Profile for Network-Level IRI 79 verification sites are typically 0.1-mi long, and the surface types of the verification sites include AC, surface treatment, jointed PCC, and continuously reinforced PCC. • One state DOT indicated that verification sites that are approximately 1,300-ft long are established on AC, transversely tined PCC, and longitudinally tined PCC pavements.
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80 Inertial Profiler Certification for Evaluation of International Roughness Index In California, the fee for certifying a vendor's operator is $500. Alabama is the other state that requires vendors' operators to be certified.
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Collection of Inertial Profile for Network-Level IRI 81 also establish verification sections in different parts of the state and require the profiler to collect data at these sites. If the state DOT is collecting network-level data, data collected at the verification sections can be compared with data previously collected at these sites by the state DOT.
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82 Inertial Profiler Certification for Evaluation of International Roughness Index the vendor had its own data quality management plan and that it follows that plan. Typically, the procedures the vendor must follow during data collection, including the QC procedures, are part of the contract between the state DOT and the vendor for collecting the network-level data.
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From page 83... ...
Collection of Inertial Profile for Network-Level IRI 83 The items related to network-level profile data collection that can be addressed in a data quality management plan include • Equipment calibration, such as calibrating the distance measuring instrument; • Equipment operational checks, such as block check and bounce test; • Periodic testing at verification sections during data collection; • Routines for checking whether IRI computed from the data are within expected range; • Routines for checking data with previously collected data to identify inconsistencies; and • Routines for checking missing road segments. Table 38 shows a summary of the responses from the 12 state DOTs that currently have a data quality management plan in place, indicating which of the previous items are addressed in their data quality management plan.
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84 Inertial Profiler Certification for Evaluation of International Roughness Index 3. Collection of data at verification sites during network-level data collection.
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Collection of Inertial Profile for Network-Level IRI 85 9. Procedures adopted by the vendor when collecting data to ensure quality data are being collected: The following is a combination of the response from both vendors on the procedures that are used to ensure that quality data are collected: – Perform in-house testing to ensure proper calibration of the equipment.
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