Enhancing Internal Trip Capture Estimation for Mixed-Use Developments (2011) / Chapter Skim
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Appendix C - Procedures for Internal Capture Surveys
Appendix C - Procedures for Internal Capture Surveys
Pages 124-139
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From page 124... ...
However, all data listed will be needed for a typical internal capture trip generation analysis. Special or limited studies may require more, less, or different data.
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From page 125... ...
In either case, the purpose may be to enhance the existing internal trip capture database or to establish internal capture rates for a similar MXD. Under both choices, the data to be collected, the survey instrument, and the interview procedures remain the same.
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From page 126... ...
If the purpose of the data collection effort is to determine internal capture at a site similar to a proposed MXD, the analyst should take a slightly different approach. First, the analyst must define the proposed MXD in terms of the independent variables collected in Step 3.
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From page 127... ...
Step 5: Collect Internal Trip Capture Data The on-site internal trip capture data collection effort must be comprised of at least two components.
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From page 128... ...
If more than 5 percent of the building square footage is occupied by a secondary use, treat it as a separate land use so internal capture can be quantified. For both the primary and secondary land uses in a building site, classify them in accordance with ITE Trip Generation Land Use codes (1)
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From page 129... ...
For the purposes of internal capture data collection and data analysis, the following convention for determining a building center of gravity is used: • for an enclosed retail mall with more than one anchor store, use inside entrances for anchor stores. It is important to use the location of the mall-side, not outside, entrance; • for an open-air community or neighborhood shopping center or for an enclosed mall with a single anchor store, use the location of the main entrance for primary tenant.
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From page 130... ...
At each of these latter entrances/exits, select an interview location. It is not necessary to interview at external site access points where only external trips from specific single-use buildings can be made, but these must be counted (person trips by mode)
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From page 131... ...
person trip generation count for establishment being surveyed and 2. for computing an expansion factor to be applied to the interview data.
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From page 132... ...
Specify business/building 1. Auto driver 2.
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From page 133... ...
4. Outside (name survey site)
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From page 134... ...
This form or an automated equivalent can be modified to meet specific survey site needs. Cordon counts may also be needed for factoring and/or checking total external trips.
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From page 135... ...
Counts should be made for the complete survey period. The survey supervisor should have extra personnel to provide short breaks for the counters to use restrooms.
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From page 136... ...
Counts should be made for the complete survey period. The survey supervisor should have extra personnel to provide short breaks for the counters to use restrooms.
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From page 137... ...
Step 5J: Check Data after Each Period The survey supervisors should perform a check of the counts and interviews immediately after each survey period. The check should be included in the QA/QC plan, but should generally include at least the following: • Counts: – count covers full period; – inbound and outbound balances are logical; – variations by 15-minute period are logical; – modal splits are within the expected ranges; – vehicle occupancies are in expected ranges; – for cordon counts, it is desirable to total the counts to see if they appear reasonable, particularly the balances between inbound and outbound; – for door counts, for each land use, compare inbound and outbound totals to make sure the balance appears logical; and – if discrepancies are found, determine if corrections can be made, and if not, schedule a recount(s)
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From page 138... ...
After the expansion factors are applied at either the land use or establishment levels, a summary of internal capture can be created. This should be performed for each end of a trip and in the inbound and outbound directions; that is: • Land Use A – outbound trips to internal destinations at each other land use, plus outbound trips to external destinations; and • Land Use A – inbound trips from internal origins at each other land use, plus inbound trips from external origins.
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From page 139... ...
street peak hour. References 1.
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