Question

-B- A study of freeway flow at a particular site has resulted as follows: q = 40D(2 -0.01D) - Determine a- The Capacity, critical speed, critical density, b- Average and minimum spacing and headway.

Answer 1

sol? 9 = 400(2-0.010) q = 800 -0.40² volume q= capacity D = density for critical density 1 Jam density dq ID d (800 -0.4D2) do 80-0.80 = 0 D = 80 0.8 mean density (D x Loo Critical density De = 20 Dc = 200 velyken here =2xto capacity at D= Loo 9 - 800 -0.402 goxlw-0.4x1602 q 4000 ver verur

capacity q= kv k=density Ve velocity 4000 - Los xv Mean velocity 40 kr/her Critical relocity/(V)= 20 free flow relocity go komph : 2x40 6 paverage space headway Mean volume = xvelocity space headway ang space headway (5) = Louo XV [q rehlur r= kraph q Lovo x 40 4000 こ Sang Lom looo minimum space headway = Loooxvef 'D = vel/km Smin Maxa density Sun Loro Lowo X VC Domax q 6min Lood 2w Smin - 5 m