Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling (2017) / Chapter Skim
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Pages 24-37

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From page 24...
... 24 The air quality analyst typically makes decisions about the appropriate level, quantity, and precision of GAV data in consultation with the regulatory agency requiring the study. This chapter focuses on the techniques used to collect the GAV data.
From page 25...
... Data Collection and Development 25 include infrared, radar, video, and acoustic technologies that can involve either permanent installations or temporary arrangements based on the purpose of the analysis. 6.1.2 Vehicle Mix Given the range of GAV that travel on airport roadways, particularly large international airports, determining the mix of vehicles often is a challenge.
From page 26...
... 26 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling Table 6-2. Travel mode choice data collection methods and sources for traffic count programs.
From page 27...
... Data Collection and Development 27 6.1.5 Existing Data Collection Considerations Table 6-4 summarizes the optional approaches to collecting and/or developing data about the existing traffic volume, vehicle mix, average travel speed, and idle/dwell times of GAV operating at an airport. Any combination of these techniques may be used for GAV data collection for any emissions inventory; however, the more advanced and automated techniques will generally be appropriate for Tier II or Tier III analyses.
From page 28...
... 28 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling • Lead and lag times. Air passengers arrive via GAV prior to their scheduled departure (lead time)
From page 29...
... Data Collection and Development 29 ACRP Report 40 (LeighFisher 2010) introduced the following four-step transportation modeling approach to estimate future airport roadway traffic volumes: • Step 1.
From page 30...
... 30 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling 6.2.1.1.5 Vehicle occupancy. In addition to travel mode choice, vehicle occupancy (i.e., the number of passengers per vehicle)
From page 31...
... Data Collection and Development 31 Travel Mode Circulation Pattern Percentage Private Vehicle(s) Drop off at curb, then exit 31 Drop off at curb, then park – Hourly, remain 9 Drop off at curb, then park – Hourly, then exit 4 Drop off at curb, then park – Daily parking 7 Drop off at curb, then park – Economy parking 4 Direct to park – Hourly, remain for duration 4 Direct to park – Hourly, exit immediately 14 41yliaD–krapottceriD Direct to park – Economy 9 4noitacoltropria-ffoottceriD Total 100 Rental Cars Direct to rental car return 73 Drop off at curb, then rental car return 23 Direct to off-airport location 4 001latoT 38tixeneht,ffoporDsbacixaT Drop off, then hold area 17 001latoT Source: LeighFisher (July 2009)
From page 32...
... 32 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling passenger trips. Based on the airport's operations and facilities (e.g., the availability and cost of short-term parking or availability of a cell phone lot)
From page 33...
... Data Collection and Development 33 Report 40, the volume of GAV trips generated by air cargo should be estimated separately from that generated by airport employees (LeighFisher 2010)
From page 34...
... 34 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling 6.2.2 Distributing Future Roadway Traffic Step 2 for estimating future-year GAV is determining the volume distribution from the airport entry and exit point(s) and on the airport's roadways.
From page 35...
... Data Collection and Development 35 travel times. Unlike city streets, internal airport roadways limit the number of path options, which simplifies this analysis.
From page 36...
... 36 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling 6.2.4 Regional (Off-Airport) GAV Data When preparing an airport air quality assessment, the most common convention is to include only the GAV that operate within the airport's property line because doing so is consistent with two common tenets of airport emissions modeling: • SIP surface transportation emissions.
From page 37...
... Data Collection and Development 37 The gravity model method may be appropriate if the analyst is developing a regional (offairport) GAV forecast for an uncomplicated project emission inventory (e.g., Tier I)

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