Category | Assignment | Subject | Civil engineering |
---|---|---|---|
University | National University of Singapore (NUS) | Module Title | CE4221 Design of Land Transport Infrastructures |
A transit agency is planning to build a heavy rail transit line and wants to evaluate the capacity of cab signalling system and moving block signalling system with fixed safety distance. The plan is to use trains consisting of a maximum of eight 75-ft cars. Trains will operate at a maximum of 60 mi/h (88 ft/s) and will be traveling at 32 mi/h (47 ft/ s) when entering stations if the cab signalling system is chosen, and at 34 mi/h (50 ft/s) if a movingblock system is selected. Safety distance for moving block signal is 165 ft, breaking speed
factor is 0.75 (75%), acceleration/deceleration is 4.3 ft/s2 , time lost in breaking jerk limitation is 0.5 seconds, and brake system reaction time is 1.5 seconds. The minimum train separation is 49.1 seconds for cab signalling system.
Transit authority currently runs a bus service on one-way two-lane (i.e., Type 2 lane) in the non-CBD area of a metropolitan city, with a peak frequency of 10 buses/hour in mixed traffic. Buses stop at every stop, with an average block length (i.e., the distance between stops) of 660 ft.
The current boarding scenario reflects double-channel non-level boarding using smartcard, in which 45% of passengers use channel 1, and the remaining 55% use channel 2 of the front door. All alighting passengers use the single-channel rear doors with smartcard checkout. The bus facility has two types of stops, whose specifications are provided below:
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