Calculate the maximum traffic volume for the design lane (Directional Design hourly volume per lane: DDHV per lane) of Highway route no. 410, Ban Hua Taphan - Than-To section, which is a two-lane highway with an average daily traffic volume of 1,000+XYZ = 1,XYZ vehicles per day, assuming traffic to direction ratio (Directional Distribution: %D) 65:35. The specific rate of rush hour per average daily traffic volume (%K) equals to 12% with a constant rate of traffic flow per 15 minutes (Peak hour factor (PHF) equals 0.85. Then use AASHTO 1993 method to design a new pavement section of Highway route no. 410, Ban Hua Taphan - Than-To section. The highway has 3 layers. that the material properties are as listed in Table 1. Materials of Pavement Layers CBR Approximate Resilient Modulus (MR in psi) 360,000 1. Surface (Asphaltic Concrete) n.a. 2. Base Course (Crushed Rock) 80 40,000 3. Sub-base Course (Soil Aggregates) 25 20,000 4. Sub-grade (Existing Soil) 5 6,000 Given: Reliability for design (R) = 95% Overall Standard Deviation (So)=0.35 Initial Serviceability Index = 4.2 Terminal Serviceability Index = 2.2 Drainage Modifying Factor of Base Course (m2) = 1.0 and Factor of Sub-base Course (m3)=1.0 No Seasonal Variations of Subgrade Properties Di SNI / ai D22 [SN2 a1D1*]/a2m2 D32 [SN3 aiD-a2D2*m2]/a3m3 => a 0.4 x log [Esurface]-1.82 = a2 0.249 x log [Ebase] -0.977 a3= 0.227 x log [Esubbase]-0.839 W18 DD x DL x w18 Traffic Adjustment Factor = [(1+r)^"]/r Ec=57,000(f.) 0.5 Sc=8(fe)0.5