Please Answer All The Questions 1 (88.33 KiB) Viewed 21 times
SECTIONC 4 (a) A site is proposed for a composite office and commercial development that would provide 60,000 sq.m. Gross Floor Area (GFA) of office and 100,000 sq.m. GFA of commercial/retail facilities. According to a trip generation survey conducted at similar type and scale of developments, the following person trip rates (using mechanised mode of transport) in the most critical PM peak hour were established: Land Use Unit Person Trip Rates Generation Attraction (Leaving site) (Arriving site) 1.02 0.42 1.88 2.14 Office Trip /hour / 100m2 GFA Commercial / Retail Trips / hour / 100m GFA It is assumed that the mode choice of people (taking mechanised mode of transport to/from the development site) between private car and public transport would follow a Logit formulation with linear utility function of independent variables expressed as follows: U= Mode bias - 0.090* in-vehicle journey time (in minutes) -0.135* access time (in minutes) - 0.085 * transport cost in HK$) where the Mode bias is 0.750 for private car, compared with 0 for public transport. (1) Given the following average time and cost for travelling to/from the development site, derive the mode share of people travelling to/from the development site by private car and public transport during the PM peak hour. [20%) Parameter By Car By Public Transport In-vehicle journey time 25 min 20 min Access time (incl. walk and waiting) Transport cost (incl. car parking) HK$10 (ii) Based on the mode share derived in (i), estimate the private car trips (in vehicles/hour) induced by the development in each direction during the PM peak hour, assuming an average occupancy of 2 persons per car. [15%] (iii) Among those public transport passenger trips induced by the development, it is assumed that 70% would be by rail via a station close to the development site. It is noted that under the "Reference" (i.e. "Base Case") scenario, the PM peak passenger flows on the section of railway line downstream from the site are: Reference Railway Line Flow Leaving site: 8,500 pphpd (passengers per hour per direction) Approaching site: 12,800 pphod Assuming a design capacity of 17,800 pphpd based on the density of 4 passengers per sq.m. (4ppsm), calculate the PM peak hour VC (Volume / 18 min. 3 min. HK$50
Capacity) ratios in each direction of the railway line under the "Reference" and "Design" scenarios. [25%] (iv) A footbridge is proposed to directly connect the subject development site to the nearby rail station. Based on the rail passenger demand estimated in (iii), what would be the clear width of the footbridge required to achieve a Level of Service (LOS) A during the PM peak hour (refer to the table below for LOS definition) Flow rate (ped/min/m, 2-way) <= 16.4 <= 23.0 <= 32.8 <= 49.2 <= 75.5 > 75.5 [20%) 6) In general, what are the key traffic planning considerations when determining the location of vehicular access to a proposed development site? [20%] LOS А B с D E F
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