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Pavement Roughness Modeling Using Regression And Ann Methods For Ltpp Western Region

Table 2: Verification of the IRI equation from previous study and comparison with the enhanced dummy regression equation using data sets from test sections in California and Wyoming

Model verification for test sections in California – (No-freeze climate zones)
Equations References Pearson’s R for Measured vs Predicted IRI % difference compared to measured IRI (average)
Eq. 1 Meegoda and Gao (2014) 0.724 29.7%
Eq. 3 Established in this study 0.456 17.6%
Number of data points for verification = 10
06-2002(2007), 06-2038(2011), 06-2647(2007), 06-2467(2007), 06-7452 (2010), 06-7452(2011), 06-7491(2007), 06-814992007), 06-8150(2007), 06-8202(2007)
Model verification for test sections in Wyoming – (Freeze climate zone)
Equations References Pearson’s R for Measured v.s Predicted IRI % difference compared to measured IRI (average)
Eq. 1 Meegoda and Gao (2014) 0.233 212.6%
Eq. 3 Established in this study 0.447 25.0%
Number of data points for verification = 6
56-2015 (2007), 56-2017(2007), 56-2019(2007), 56-2020(2007), 56-772(2007), 56-7773(2007)
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