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17 17 St States Known to Allow Reduced Tracking Tack Materials Tr • Alabama • New York • Florida • North Carolina • Georgia • Ohio • Illinois • Oklahoma • Louisiana • South Carolina • Maryland • Tennessee • Mississippi • Virginia • Pennsylvania • West Virginia • Texas

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NCHRP Report 712 • Looked at numerous test • Variety of surfaces both methods (shear, tension, AC and PCC torsion) • New • Old • Many tack materials • Milled • Four application rates • Unmilled (gsy residual) • Dry • 0.00 • Wet • 0.031 • Clean • 0.062 • Dirty • 0.155 • Eight test temps. • International survey • -10—60°C

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