References & Calcs

References & Calculations

Calculating Transit System Peak Hourly Passenger Capacity

Dedicated Bus Lane Can Move More Passengers then a Light Rail Line

  1. Wikipedia, "Bus rapid transit"
  2. Samuel, Peter, “Busway vs. Rail Capacity: Separating Myth from Fact,” February 8, 2002, p. 4

  3. Transit Capacity and Quality of Service Manual 2nd Edition,  "Part 5 Rail Transit Capacity," p 5-51.

  4. Wikipedia, “Link Light Rail200 passenger car capacity with 74 seats support 4-car trains, 4*74 = 296 seated passengers per train

  5. Sound Transit, "DRAFT 2016 Service Implementation Plan," October 12th 2015,
     p 117, Table 17 - Standing Time Corrective Action Priority for Rail Modes 
    Link load factor for over 30 minutes is 2.0  Which equals to a standee capacity of 296 passengers per train.
  6. ibid, p 116,
    Table 14.  Load Factor Standards by Bus Type; 

     Bus type Number of Seats Max. Passenger Load Load Factor
     40' High Floor 4263 1.5 
     40' Low Floor 3755 1.5 
     45' High Floor 57 701.23 
     60' Low Floor 56 811.45 
     42' Double Decker 77 95 1.23
    (latest double decker buses have 81 seats)
  7. ibid, p 117, Table 17 - Standing Time Corrective Action Priority for Rail Modes 
    Link 2.0 load factor for over 30 minutes
  8. 1-way capacity equals number of sitting and standing riders times 30 trains/hr or 360 uses per hour
     Bus type Number of Seats Max. Passenger Load standees seated x360 standee
    x360
     Load Factor
     40' High Floor 4263  21 15,120 7,5601.5 
     40' Low Floor 3755  18 13,320 6,4801.5 
     45' High Floor 57 70 13 20,520 4,6801.23 
     60' Low Floor 56 81 25 20,160 9,0001.45 
     42' Double Decker 77 95 18 27,720 6,480 1.23
  9. Light rail capacity = 296 seated/train * 20 trains/hr = 5,920 seated per hour = 6,000 standees/hour
  10. (light rail seated)/(bus seated capacity) = 6,000/27,720 double decker = 0.32. 1-0.32=68% less seated capacity

  11. (light rail total)/(bus total capacity) = (8,880+8,880) /(27,720+6,4380) double decker = 0.52, . 1-0.52=48% less total capacity

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