Question

(a) A two-lane highway carrying an AADT of 6600 vpd is located in level terrain in an area where the design hour factor, K, is 0.12. The area has a traffic growth rate of 5 percent per year. The responsible highway agency's policy is to expand two- lane highways to four-lanes before the Level of Service becomes E during peak periods In how many years will expansion of the facility have to be completed under this policy? (10 Marks) If it will take 7 years to construct a four-lane highway, how long will it be before the construction project should begin? (5 Marks) (11)

Answer 1

Solution - Il in given in the question that s Annual average daily traffice (Anor) at present - 6600 vehlday. - Design hour factor is 012 Rate of growth 25.1. per year Since, Design houn facton Design hounly yo vol. of Waffice AADT o11 - DHU = 0. 12 x6600 792uehlha. 6600 DHV (Design hourly volume ) for which highway in to design, It in volume per thorn. for per day, volume of traffic :792824 "A" 1 2008 vallha

o of facility :: years will expansion formula to be used 00 where, n = Time perioid 1g008 - 6600 105 loo 221.68 2.88 = (1.05)" taking logio on both side : log.o2.88 nlogio (1.05) no togio 2.08 0.4594 e logiol1.05) 0.02118 Inwar 21.68 in 22 years b Since 22 years take to rea clesign traffice. If a 7 years take to reach on construct 2-lane to u lane. then, 22-7-15 years .. 15th year, it should start, do, at 22 year, whole work finished.

Summery : Formula k. DHV АГАРГ A :( 1tY) =) 22 years take to reach the bart, design