Question 2. [10 marks] A metro line operates during peak hours with four-car trains at three-minute headways. The passenger volumes at each station are given below. The capacity of each car is Cy = 120sps/veh. The minimum headway that can be maintained on an open line between stations with existing block signals at present operating speeds is 80s, while the minimum headway at a station is 135s. The current one-way operating time is 22 minutes and terminal time is 3 minutes at each terminus. Station (A to D direction) D Boarding (prs/hr) 3000 3600 2000 0 Alighting (prs/hr) 0 200 600 7800 Station (D to A direction) D B A Boarding (prs/hr) 4500 4800 2200 0 Alighting (prs/hr) 0 500 3600 7400 Compute: (i) Line capacity according to the current schedule. (ii) Identify the MLS. What is the passenger volume and load factor at MLS at present? (iii) The headway for this line if the design value of load factor on MLS is 0.85. Give your answer in multiples of 5 seconds. (iv) Way capacity of the line Maximum offered line capacity and maximum utilized line capacity (vi) Analyze and discuss the impacts of changing the headway from its current value to your answer in (iii)