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presented to
MTF Transit Committee
presented by
Scott Seeburger, Myung Sung, Dave Schmitt & Peter Haliburton
November 20, 2008
2008 Tri-Rail On-Board Survey
2
Topics
1. Why the survey?
2. FTA’s interests/concerns
3. Addressing FTA’s concerns
4. Survey instrument
5. Survey sample and response rates
6. Survey implementation
7. Ancillary Data
8. Expansion & model validation approach
3
Tri-Rail
72-mile commuter rail system
18 stations across 3 counties
1:45 traveling time
About 52 trains/day
Daily ridership
• ~8,000 (2000)~8,000 (2000)
• ~11,000 (March 2007)~11,000 (March 2007)
• ~16,000 (October 2008)~16,000 (October 2008)
4
Why the Survey?
FTA requires current & system-wide transit rider data be collected for model testing if model forecasts will be used for New Starts PE applications
Ridership has increased 45% since the last survey was conducted (March 2007), so the characteristics of the new riders need to be understood
5
FTA’s Thoughts on Surveying “Good Practice”
The survey must include certain data items for comparisons
The sample must be controlled, so that it can be expanded to a full data set that is representative of all riders
6
FTA’s Thoughts on Surveying “Good Practice” (2)
The sampling plan must…
• Be designed with transit markets & rider characteristics in mind
• Carefully allocate the sample so as to minimize bias
• Account for non-response biases
• Include count data for sample expansion
• Discuss surveying methods
7
FTA’s Thoughts on Surveying “Good Practice” (3)
The instrument should include a minimum amount of data items…
• Trip origin and destination
• Purposes at the origin and destination
• Access and egress modes
• Transit path
• Rider characteristics
8
Addressing FTA’s Thoughts
Collecting boarding/alighting counts by station by train to assist with survey expansion
Counting vehicles at park-ride stations to avoid expansion bias (see next slide)
Scrutinize question types, organization and wording to improve response rates and avoid bias
Incorporate lessons from previous survey
9
Uniform Expansion
Daily Daily boardingsboardings 600600
Completed Completed surveyssurveys 1515
Walk-accessWalk-access 22
Drive-accessDrive-access 1313
Revised Expansion
Daily Daily boardingsboardings 600600
Completed Completed surveyssurveys 1515
Survey weightSurvey weight 40.040.0Walk-access Walk-access tripstrips 8080
Drive-access Drive-access tripstrips 520520
Park-ride lot count = 15
cars
Walk-Access Walk-Access ExpansionExpansion
Daily Daily boardingsboardings 570570
Completed Completed surveyssurveys 22
Survey weightSurvey weight 285.285.00
Drive-Access Drive-Access ExpansionExpansion
Daily Daily boardingsboardings 3030
Completed Completed surveyssurveys 1313
Survey weightSurvey weight 2.312.31
Survey Results It is important to conduct auxiliary counts to improve survey expansion!
10
Incorporating Lessons from the 2007 Survey…
There was a high amount of auto egress – is this real?• Count egress modes at individual stations
There are many short trippers who may not have enough time to complete survey• Ask critical questions via intercept survey• Have crew stress critical questions
34% of all records came from students• Special counts by on-board crew• Special access/egress counts at individual stations
Two-car or overnight parkers
Survey Instrument
11
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Survey Sample
Half-Day On-Board Survey with Full-Day Door Counts• 30 trains out of a total of 50 trains• Both northbound and southbound
Response Rate• Ridership Counts (10-22-08)
− 15,662• Surveys Distributed
− 8,403 (54%)• Surveys Collected
− 6,104 (72%)
13
Survey Implementation
Pretest
Training, October 21, 2008• Three sessions for 150 temps and 25 professionals
Door Count and Survey Distributions- Temps
Train/Car Captains- Professionals
Conducted Wednesday, October 22, 2008• Start to 2:00 PM- Surveys
• All Day- Door Counts
14
Supplementary Station Counts
Control for non-response bias• Overnight parking
• Auto-egress
• Short trippers
• School trips
14 of 18 stations
15
1. Mangonia Park
2. West Palm Beach
3. Lake Worth – short trips only
4. Boynton Beach
5. Boca Raton
6. Deerfield Beach
7. Pompano Beach – short trips only
8. Cypress Creek
9. Fort Lauderdale
10. Fort Lauderdale Airport
11. Hollywood
12. Golden Glades
13. Metrorail
14. Miami Airport
Survey Elements
Overnight Parking Counts
Mode of Access
Travel distance query
Boarding and alighting counts
Mode of Egress
16
Partial Survey Results
ACCESS MODE
MODE TOTAL %
Walk 241 11%
Bike 120 5%
Schoolbus/ Metrorail 0 0%
Transit Bus 265 12%
Tri-Rail Shuttle 131 6%
Park N Ride 736 33%
Rideshare N Park 111 5%
Taxi 26 1%
Drop-Off 626 28%
Other 5 0%
Total 2261 100%
67% auto access
17
Partial Survey Results
EGRESS MODE
MODE TOTAL %
Walk 423 22%
Bike 107 6%
Schoolbus/ Metrorail 0 0%
Transit Bus 231 12%
Tri-Rail Shuttle 587 31%
Park N Drive 153 8%
Rideshare N Drive 48 3%
Taxi 41 2%
Pick-Up 319 17%
Other 5 0%
Total 1914 100%
30% auto egress
18
Observations
Large number of non-Tri-Rail related vehicles parked overnight• Business staging
• Vehicle exchange
• Ridesharing
Many passengers making indirect trips
19
Expansion & Model Validation Approach
1. Expand survey as disaggregately as possible, some options include: by origin/destination station, access/egress mode, and time of day
2. Verify expansion & survey data by preparing several different cross-tabulations and compare with auxiliary count information
3. Re-expand survey if needed
4. Prepare survey data for mode choice calibration
5. Calibrate mode choice model
6. Compare estimated results to survey results across many dimensions to verify model reflects rider patterns (see next slide)
7. Re-expand survey or re-calibrate if needed
20
Sample Mode Choice TestGeography by Access Mode
WALKWALK PBPB BOBO MDMD
PBPB 1,1111,111 2,2222,222 3,3333,333
BOBO 4,4444,444 5,5555,555 6,6666,666
MDMD 7,7777,777 8,8888,888 9,9999,999
BUSBUS PBPB BOBO MDMD
PBPB 1,1111,111 2,2222,222 3,3333,333
BOBO 4,4444,444 5,5555,555 6,6666,666
MDMD 7,7777,777 8,8888,888 9,9999,999
METRMETRORAILORAIL PBPB BOBO MDMD
PBPB 1,1111,111 2,2222,222 3,3333,333
BOBO 4,4444,444 5,5555,555 6,6666,666
MDMD 7,7777,777 8,8888,888 9,9999,999
PNR/ PNR/ KNRKNR PBPB BOBO MDMD
PBPB 1,1111,111 2,2222,222 3,3333,333
BOBO 4,4444,444 5,5555,555 6,6666,666
MDMD 7,7777,777 8,8888,888 9,9999,999
Compare estimated results to survey results across as many dimensions as possible
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