Annex 3B: Guidelines for Asphalt Pavement 460 Table 1. Axle Load Equivalency Factors for Flexible Pavements, Single Axle, and Pt. of 2.0 Axle Load Pavement Structural Number (SN) (kips) 1 2 3 4 5 6 2 0.0002 0.0002 0.0002 0.0002 0.0002 0.0002 4 0.002 0.003 0.002 0.002 0.002 0.002 6 0.009 0.012 0.011 0.01 0.009 0.009 8 0.030 0.035 0.036 0.033 0.031 0.029 10 0.075 0.085 0.090 0.085 0.079 0.076 12 0.165 0.177 0.189 0.183 0.174 0.168 14 0.325 0.338 0.354 0.350 0.338 0.331 16 0.589 0.589 0.613 0.612 0.603 0.596 18 1.00 1.00 1.00 1.00 1.00 1.00 20 1.61 1.59 1.56 1.55 1.57 1.59 22 2.49 2.44 2.35 2.31 2.35 2.41 24 3.71 3.62 3.43 3.33 3.40 3.51 26 5.36 5.21 4.88 4.68 4.77 4.96 28 7.54 7.31 6.78 6.42 6.52 6.83 30 10.40 10.00 9.20 8.60 8.70 9.20 32 14.00 13.50 12.40 11.50 11.50 12.10 34 18.50 17.90 16.30 15.00 14.90 15.60 36 24.20 23.30 21.20 19.30 19.00 19.90 38 31.10 29.90 27.10 24.60 24.00 25.10 40 39.60 38.00 34.30 30.90 30.00 31.20 42 49.70 47.70 43.00 38.60 37.20 38.50 44 61.80 59.30 53.40 47.60 45.70 47.10 46 76.10 73.00 65.60 58.30 55.70 57.00 48 92.90 89.10 80.00 70.90 67.30 68.60 50 113.00 108.00 97.00 86.00 81.00 82.00 Note : Adopted from AASHTO Appendix D