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1. Estimating Ridership of Rural Demand-Response
Transit Services for the General Public
TRB 96th Annual Meeting
January 9, 2017
Jeremy Mattson
Small Urban and Rural Transit Center
Upper Great Plains Transportation Institute
North Dakota State University
2. Objective
Develop a model for
estimating demand for rural
demand-response transit
services for the general
public
3. Previous Demand Models
TCRP Report 161: Methods for Forecasting Demand and Quantifying Need for
Rural Passenger Transportation
• General public rural passenger transportation
• Passenger transportation specifically related to social services or other programs
• Fixed-route transit in micropolitan areas
• Commuter services from rural counties to urban centers
ADA Paratransit Research
• TCRP Report 119: Improving ADA Complementary Paratransit Demand Estimation.
• TCRP Report 158: Improving ADA Paratransit Demand Estimation: Regional Modeling.
• Goodwill and Joslin (2013) Forecasting Paratransit Services Demand - Review and Recommendations.
National Center for Transit Research, University of South Florida.
4. TCRP Report 161: Demand for rural general public,
non-program-related service
• Two methods
– Peer data
• Passenger trips per capita, passenger trips per vehicle mile, passenger trips per
vehicle hour
• Calculate mean, median, and ranges for systems in similar settings
– Demand function developed based on 2009 rural NTD data
• Based on the assumption that older adults, people with mobility limitations, and
people without access to a vehicle represent the main users of these services
Non-program Demand (trips per year) = (2.20 x Population Age 60+) + (5.21 x Mobility
Limited Population Age 18-64) + (1.52 x Residents of Household Having No Vehicle)
5. Factors Affecting Ridership
• Demand for the service
– Population
– Demographics
• Level of service provided/Service
characteristics
– Days per week
– Hours per day
– Advance reservation requirements
– Both demand-response and fixed-route?
– Overlap in service area?
– Regional or cultural differences, tribal transit?
• Cost of the service
6. Population and Demand-Response Transit Ridership
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
200,000
0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000
PassengerTrips
Service Area Population
7. Models
• Two models
• Data sources
– Model #1
• Rural National Transit Database, 2013
• American Community Survey (ACS) 2009-2013 5-year estimates
– Model #2
• Survey of rural transit agencies
8. Model #1
• Ridership is determined by:
– Demand factors
• Service area population
• Demographic characteristics of service area
– Percentage older adult (65 or older)
– Percentage without a vehicle
– Percentage with a disability
– Service characteristics
• Operates both fixed-route and demand-response
• Service area overlaps
• Serves only a municipality
– Fare level
– Other
• Tribal transit
• Region
• Data for 731 agencies for 2013
9. Limitations of Rural NTD Data
• Incomplete and imprecise service area information
• No data:
– Hours per day
– Days per week
– Advance reservation requirements
– Type of service provided
10. Survey of Transit Agencies
• Previous study conducted in North Dakota and
Florida
– Developing a Method for Assessing National
Demand-Response Transit Level of Service. Ranjit
Godavarthy, Jeremy Mattson, Patrick Nichols, Del
Peterson, and Jill Hough. University of South Florida,
Tampa: National Center for Transit Research, 2015.
– Journal of Public Transportation, 18 (4): 1-15.
11. Survey of Transit Agencies
• Collected detailed information
– Geographic service area
– Span of service
– Advance reservation requirements
– Service eligibility and type
• Additional surveys conducted
nationwide
• Data collected for 68 rural demand-
response transit agencies
12. Model #2
• Ridership is determined by:
– Service area population
– Hours of service per day
– Days of service per week
– Advance reservation time
– Operates both fixed-route and demand
response
– Fare level
13. Results: Model #1
Independent Variable
Estimated
coefficient
Standard
error
p-value
Ln(Population) 0.83 0.02 0.000
Percentage elderly 7.99 0.99 0.000
Percentage with no vehicle 21.15 5.65 0.000
Percentage with disability -0.46 1.20 0.703
Fixed-route -0.65 0.11 0.000
Percentage overlap -0.41 0.10 0.000
Municipality 0.77 0.10 0.000
Tribal 0.30 0.31 0.333
Ln(Fare) -0.24 0.04 0.000
Region 1 -0.60 0.33 0.071
Region 2 -0.57 0.42 0.170
Region 3 -0.56 0.25 0.027
Region 4 -0.81 0.19 0.000
Region 5 0.50 0.20 0.012
Region 6 -0.15 0.22 0.480
Region 7 -0.36 0.19 0.057
Region 8 0.09 0.19 0.628
Region 9 0.16 0.25 0.523
14. Results: Model #1
• Population has a positive effect on ridership.
– A 1% increase in population leads to a 0.83% increase in ridership.
• Demographics impact ridership.
– Areas with a higher percentage of older adults or households without
access to a vehicle have higher levels of ridership.
– If the percentage of the population that is aged 65 or older increases by
one percentage point, ridership increases by 8%.
– If the percentage of the population without a vehicle increases by one
percentage point, ridership increases by 21%.
15. Results: Model #1
• Agencies that provide both fixed-route and demand-response
service have lower levels of demand-response ridership than
agencies that provide just demand-response service, after
accounting for all other variables.
• Agencies that serve areas where more than one transit provider is
available have lower levels of ridership.
• Demand-response providers that strictly serve a municipality have
higher levels of ridership than those serving a larger geographic
area, after accounting for population and other factors.
16. Results: Model #1
• Fares have a negative impact on ridership. A 1% increase in fares
leads to a 0.24% reduction in ridership.
• There are some regional differences in ridership not accounted
for by these variables. Notably, region 5 agencies have higher
levels of ridership, and agencies in regions 3 and 4 have lower
levels.
17. Out-of-Sample Validation
• Results from the model were used to predict ridership for 2014
• Predicted ridership was compared to actual ridership
Model #1 TCRP 161 Model
Population under 100,000 (n=688)
RMSE 55,579 73,941
MAE 23,506 28,669
Population under 50,000 (n=544)
RMSE 48,231 71,439
MAE 19,536 26,027
18. Results: Model #2
Independent Variable
Estimated
coefficient
Standard
error
p-value
Ln(Population) 0.69 0.07 <.0001
Percentage population with 6 or 7 days 1.65 0.80 0.0439
Percentage population with 5 days 1.41 0.69 0.046
Percentage population with 12 or more hours 0.50 0.43 0.2545
Percentage population with less than 5 hours -0.40 1.20 0.7397
Same-day reservation 2.01 0.55 0.0006
Prior-day reservation 1.24 0.56 0.0321
Fixed-route -0.65 0.39 0.1013
Ln(Fare) -0.12 0.07 0.0843
19. Results: Model #2
• Population has a positive effect on ridership.
– A 1% increase in population leads to a 0.69% increase in ridership.
• Ridership is impacted by the number of days that service is available.
– As the percentage of service area population with service 5 days per week
increases by one percentage point, ridership increases 1.41%.
– Ridership increases 1.65% as the percentage of service area population with
service 6 or 7 days per week increases by one percentage point.
20. Results: Model #2
• Advance reservation time has a negative impact on ridership.
– Compared to agencies that require reservation two or more days in advance,
ridership is 124% higher for providers that require reservation one day in advance
and 201% higher for agencies that allow same-day service.
• Agencies that provide both fixed-route and demand-response service have
lower levels of demand-response ridership than agencies that provide just
demand-response service, after accounting for all other variables.
• Fares have a negative impact on ridership.
– A 1% increase in fares leads to a 0.12% reduction in ridership.
21. Applications
• Forecast demand for new service
• Estimate the impact of service changes
– Geographic coverage
– Span of service
– Fares
– Reservation requirements
• Project future ridership based on
population and demographic changes
22. Conclusions
• Demographic characteristics are important
– Older adults
– People without access to a vehicle
• Geographic characteristics of service are
important
• Fare elasticity estimated at -0.12 to -0.24
• Availability of service/quality of service
impacts ridership
– Agencies providing more days of service had
higher levels of service
– Advance reservation time is important
23. Conclusions
• Two new tools for estimating ridership
• A greater number of variables and
more specific service information
improves the performance
• Limited by data availability
• Identify high-productivity systems
• Many factors specific to each agency
and community not captured by the
model