Measuring, Characterizing, and Reporting Pavement Roughness of Low-Speed and Urban Roads (2019) / Chapter Skim
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Pages 67-75
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67 This chapter summarizes the research that was performed and the primary findings, provides recommendations for implementation of the findings, and offers suggestions for future research. 5.1 Summary of the Research and Primary Findings 5.1.1 Measurement Accuracy An experiment was conducted to demonstrate the effects of potentially adverse operational conditions on the measurement of longitudinal road profile by high-speed inertial profilers.
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68 in lateral tracking affected agreement in profile and roughness more than travel speed for five of the six profilers. • Travel speed affected longitudinal distance measurement and measured IRI in turn.
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69 for computation of IRI, depending on the type of high-pass filter applied to the profile. 5.1.1.6 Dead Stop The testing program included runs where profile was collected from a dead stop.
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70 as more detailed models intended to reproduce the responses of the specific test vehicles, improved correlation further. However, these were deemed unsuitable for use in pavement management due to a lack of generality.
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71 Adapting inertial profilers for these conditions will require equipment hardware and software changes, and verifying the operational limitations of a given design will require testing effort beyond current practice. To help justify the required investment, it is recommended that (1)
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72 speed of 25 mi/hr (40 km/hr) and maximum deceleration of 0.16 g.
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73 that network-level surveys record areas of localized roughness in addition to segment-wide averages for two reasons. First, for segments with the same average roughness the repair or rehabilitation strategy will be different for a section where a large share of the roughness is concentrated in a few locations.
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74 • Replace the 9.84-in (250-mm) moving average in the IRI computation algorithm with a bridging algorithm that eliminates narrow dips in the profile, or apply an equivalent filter while measuring the profile.
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75 • Additional research is required to establish threshold values for roughness on the GCARVV scale. The thresholds must correspond to various applications of road roughness measurement, such as construction acceptance and triggers for intervention based on functional performance.
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