Methods for Forecasting Demand and Quantifying Need for Rural Passenger Transportation: Final Workbook (2013) / Chapter Skim
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Pages 6-17
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6Need is defined in two ways: (1) as the number of people in a given geographic area likely to require a passenger transportation service and (2)
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Need 7 Example Computation–Population Segments Method To obtain the required data from the ACS, go to the main Census website at www.census.gov (see Figure 2)
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8 Methods for Forecasting Demand and Quantifying Need for Rural Passenger Transportation To obtain data about the number of persons residing in households lacking a personal vehicle, enter Table B08201 in the topic or table name box and click GO (see Figure 4)
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Need 9 Once the geographic type has been chosen (e.g., county) , filtering the geography further will be necessary to obtain data for the county or counties of interest.
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10 Methods for Forecasting Demand and Quantifying Need for Rural Passenger Transportation In order to view the results once the geography has been selected, select the appropriate dataset. Use the most recent ACS 5-year dataset available.
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Need 11 Figure 9. American FactFinder Selecting Dataset.
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12 Methods for Forecasting Demand and Quantifying Need for Rural Passenger Transportation Figure 11. ACS Table B08201 Results – Bedford County, VA (Example)
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Need 13 Sum the results; this is the number of persons residing in the study area that live in a household with no vehicle available. Information on the number of persons living below the poverty level can be obtained in the same way, using ACS Table B17001.
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Figure 13. American FactFinder Table Selection – B17001 (Example)
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Need 15 developed from data in the 2009 National Household Travel Survey (see Table 6)
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16 Methods for Forecasting Demand and Quantifying Need for Rural Passenger Transportation Resource Requirements for Demand-Responsive Transportation Services provides a method for estimating the number of vehicles needed to serve a given level of demand over a given service area when the call-ahead time window and the required degree of assurance that a trip can be served are specified (http://onlinepubs.trb.org/Onlinepubs/tcrp/tcrp_rpt_98.pdf)
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Need 17 To produce an estimate for annual need, it is recommended that the daily Mobility Gap figure be multiplied by 300 days. This figure reflects that trip need is likely reduced on the weekends, but annual need is not just associated with weekdays.
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