Table 1: AADT, annual growth rate and ESAL factor by vehicle class Historical AA
ID: 1714353 • Letter: T
Question
Table 1: AADT, annual growth rate and ESAL factor by vehicle class Historical AADT 201 Annual growth factors (AGR ESAL factor per vehicle Vehicle tvpes Passenger transportation modes Passenger cars Buses 9,765 334 5% 4% 0.0008 0.6806 Single unit trucks Panel and pickup trucks Other 2-axle/4-tire trucks 2-axle/4-tire trucks 3 or more axle trucks 3,219 115 289 54 4% 2% 2% 2% 0.0122 0.0052 0.1890 0.1303 All Tractor Semi-Trailers 3 Axle Tractor Semi- Trailers 4 Axle Tractor Semi- Trailers 5 + Axle Tractor Semi- Trailers 68 102 2,981 4% 2% 4% 0.8646 0.6560 2.3719 All double trailer combos 5 Axle Double Trailers 6 Axle Double Trailers 402 79 2% 2% 2.3187 3.2180 All truck-trailor combos 3 Axle Truck-Trailers 4 Axle Truck-Trailers 5 + Axle Truck-Trailers 214 448 56 2% 2% 2% 0.0152 0.0152 0.5317Explanation / Answer
Given two lane highway thus lane distribution factor =0.9
Assuming that project life cycle is design life of rigid pavement which is given to be 20 years
AADT 2017 cumulative = 9765+334+ 3219+115+289+54+68+102+2981+402+79+214+448+56= 18126
For the various growth rates mentioned in table 1 above and using the formula AADT2018 cumulative =sum of AADT2017 individual x (1+r/100)
We get
AADT 2018 cumulative = 18913.51 = 18914
As per table 3
F Factor for 5% growth for 20 yr = 912.45
F Factor for 4% growth for 20 yr= 613.56
F Factor for 2% growth for 20 yr = 314.90
Thus for say passenger car EASL 20 yr = AADT 2018 individual * lane distribution factor * F factor * EASL factor
= 9765*(1.05)* 0.9* 912.45*0.0008 = 6736.016
Thus for total cumulative EASL after 20 yr we will add all the individual EASL of all the vehicles and the answer would be
Cumulative 20 yr EASL = 4646012.147 say = 4646013
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