Enhancing Internal Trip Capture Estimation for Mixed-Use Developments (2011) / Chapter Skim
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Pages 7-27
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From page 7... ...
This is not to be confused with shopping centers (for which ITE has specific trip generation rates)
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A data-collection framework to quantify the magnitude of travel associated with MXDs to determine appropriate reductions below single-use trip generation estimates. To accomplish these objectives, several tasks were completed: • Compilation of a state-of-the-practice summary of methods in use to estimate internal trip capture for use in TIS; • Development of a prototypes methodology to guide the subsequent work; • Analysis of internal capture relationships; • Determination of data needs; • Conduct of a pilot survey to test the data-collection methodology and provide additional data; • Identification of data gaps and suggest data to be collected; and • Documentation of the findings, conclusions, and recommendations.
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From page 9... ...
. When evaluating internal trip capture for an area, site, or activity center, the presence of safe facilities for pedestrians and bicyclists can be a factor in the ability for a project to attract and internalize higher percentages of trips.
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The interviews confirmed that the most frequently used resource for estimating internal trip capture is the ITE Trip Generation Handbook (2, p.
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Unconstrained internal trip capture rates for trip origins within an MXD. Weekday Percent Trips Captured Internally1 From To Midday Peak Hour P.M.
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Mixed-Use Development Site Internal Capture Rate Crocker Center 41% Mizner Park 40% Galleria Area 38% Country Isles 33% Village Commons 28% Boca Del Mar 33% Average 36% Trip-Maker Crocker Center Mizner Park Galleria Area Average Users 37% 38% 36% 37% Workers 46% 49% 46% 47% Total 41% 40% 38% 40% Table 6. Daily internal capture rates at FDOT sites.
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From page 13... ...
The estimated daily, midday, and evening peak period internal capture rates are quite similar. The mean values for the entire survey period shown in the table have a high degree of statistical validity; the maximum two-tailed errors calculated using the binomial distribution, with 90% confidence-level methodology, are all less than 5%.
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From page 14... ...
MXD Country Isles Village Commons Boca Del Mar Residents employed within development 3.9% NA 0.9% Employees residing within development 16.1% 16.8% 18.9% Table 13. Percent locally employed residents and locally residing employees.
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From page 15... ...
Over 39% of the daily trip ends to Brandermill residences began within Brandermill. For the shopping center trips within Brandermill, approximately two-thirds of the trips originate within Brandermill during the midday and evening peak hours.
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From page 16... ...
Work-related, eating, and shopping trips were the most common midday trips for office employees. The study also examined stops to and from work during peak periods and found that such stops within the activity centers were made on an average of 13% to 15% of the trips.
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In the A.M. peak periods, hotel trips internal within the large and largest activity centers averaged 19% and 37%, respectively, and 27% and 36% in the P.M.
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larger population communities had higher 18 Average Range OFFICE EMPLOYEES Percent who make an intermediate stop within SAC • on the way to work • on the way home from work Percent who make midday trips internal to the activity center • SACs with high level of professional employment1 • SACs with low level of professional employment 10% 11% -- -- 7% to 15% 6% to 16% 29% to 33% 20% to 23% OFFICE VISITORS -- Percent from within activity center • A.M. peak period o all SACs o small SACs o large SACs • P.M.
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From page 19... ...
. A 2003 cordon count of Celebration, Florida -- a 10-year-old, self-contained MXD of 3,500 developable acres -- compared a three-weekday cordon traffic count to estimated trip generation for development existing at that time based on ITE trip generation rates.
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From page 20... ...
TCRP Report 95, Chapter 15 also reports that vehicle trip generation is 1% to 3% less when improved pedestrian access is provided at regional shopping centers and 6% to 8% less for office employee vehicle trips at the edge city office buildings containing retail (38, p.
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. Another researcher found that vehicle trip generation rates at office buildings in suburban activity centers were 6% to 8% lower than normal and transit trips were about 3% higher than normal.
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. In California, Caltrans indicates that internal trip capture rates may exceed a 5% reduction, but requires approval and review with transportation staff (47)
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Permitted internal trip capture reductions, City of San Diego. Internal Trip Capture Procedure State Agency Max or flat % Justify/ agency approval for higher rate Agency approval ITE Trip Generation Handbook procedure Verify with survey Formula or table Other AZ Phoenix (10–15%)
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Table 28. Adjustments to ITE Trip Generation Handbook mixed-use internal trip capture rates.
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While the ULI shared parking method is applicable to MXDs, it is valid only for estimating parking accumulation and not for trip generation estimation (54) ; however, it is apparent that some preparers are using it to estimate internal trip capture.
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From page 26... ...
Developers, through payment for TIS, have typically funded most previous site trip generation research; however, since the appearance of the ITE Trip Generation Handbook that endorsed an estimation method and provided some data on capture rates for the most frequent mixed uses, a combination of high cost of internal trip capture data collection and an existing accepted method have resulted in no new comprehensive data. Since the late 1980s, there have been numerous studies of various census and regional travel survey databases, limited site data collection, and studies and surveys of related travel and development characteristics that could contribute useful material for developing an improved estimation technique.
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From page 27... ...
• Two methods are most currently used for estimating internal trip capture: The ITE method contained in the Trip Generation Handbook, 2nd edition (1) , and percentages that local agencies establish as acceptable.
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