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The Australian 3D
Roughness Experience
Richard Wix & Simon Barlow
ARRB Group
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Not to be confused with…..
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‘all you do is slow me down, And I'm trying to get on the other side of town’
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When you think of 3D, you
probably think of….
• films
• 3D films were
prominently
featured in the
1950s in
American cinema
• revival
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"Avatar-Teaser-Poster" by Source. Licensed under Fair use via Wikipedia - http://en.wikipedia.org/wiki/File:Avatar-Teaser-Poster.jpg#/media/File:Avatar-Teaser-Poster.jpg
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Did you bring your glasses?
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3D system
5
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Typically used to measure….
• transverse profile
• cracking and other
pavement defects
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Wanted to determine…..
• Can 3D sensors be used to measure
pavement roughness (smoothness)?
• Can the outputs meet current Australian
standards?
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Roughness - how measured?
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Little Book of Profiling, Sayers & Karamihas
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The missing piece…..
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Test methods
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• Cover a variety of
pavement
condition
parameters
• Roughness
reference device
loop
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Experimental method
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Experimental method
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Loop method
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Loop method
• 5 repeat runs, loop length ≥10km
• compare against reference data set
• pass/fail criteria
R2 ≥ 0.95
Ave percentage difference ≤ 5%
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Results – loop method
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Results – loop method
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Percentage difference = 0.4%
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Reference device method
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Reference device method
• five sites, 500m long, varying roughness
• three speeds plus combined
• pass/fail criteria
R2 ≥ 0.95
slope; 0.95 ≤ A ≤ 1.05
Intercept; –0.25 ≤ B ≤ 0.25
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Results – reference device method
Speed (km/h) Parameter Pass/Fail
60 (low) Coefficient of determination (r2)
Slope
Intercept (m/km)
80 (medium) Coefficient of determination (r2)
Slope
Intercept (m/km)
100 (high) Coefficient of determination (r2)
Slope
Intercept (m/km)
Combined Coefficient of determination (r2)
Slope
Intercept (m/km)
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500m sites
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Possible reasons for failure
• 15 months b/n collection of data sets
• differences in measurement line
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Future work
• effect of curves
• frequency response
• third party validation
• undertake new reference device comparison
• assess texture measurement capability
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Conclusion
• 3D sensors can be used to measure
roughness
• meets the requirements of the loop test
method but not the reference device
• possibly some minor speed dependency
issues
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Thank you
Richard Wix
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