Travel Survey Recommendations MAREN L. OUTWATER, P .E. Vice - - PowerPoint PPT Presentation

MAREN L. OUTWATER, P .E. Vice President - RSG

Travel Survey Recommendations

Household surveys have improved with smartphone-based GPS data collection.

Surveys

• Household Travel
• Transit
• Airport
• Commercial Vehicle

Passive Data

• Visitor
• Establishment
• External
• Special Generator

Household surveys have improved with smartphone-based GPS data collection.

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Multi-day surveys capture unique trips

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GPS captures 20% more trips than diary-based

methods

> Smartphones reduce non-response bias with higher trips rates for young adults

Household surveys are used to update the travel forecasting model and provide trend analytics.

Method

• Use smartphone-based surveys to reduce respondent burden and increase data quality
• Offer incentives

Sampling and Expansion

• Use address-based sampling with targeted geographic oversampling
• Apply 2-stage expansion approach

Frequency and Sample Size

• 10,000 households (0.4% of 2.5 million households in region)
• Conduct household surveys every 4-5 years

Cost

• $200-$300 per household, depending on methods, languages and incentives

Supplemental surveys are cost-effective when conducted with household surveys.

Household Travel

Toll User Intercept University Student Travel Bicycle User Intercept Ride-hailing and Carshare Travel Future Mobility Attitudes and Preferences

Survey university students via email with university cooperation Conduct attitude and preference surveys regarding autonomous vehicles

Transit surveys should be conducted after 2020.

Method

• Tablet-based intercept of transit trips
• On-to-off surveys at stations/stops

Sampling and Expansion

• Sampling and expansion based on boarding and alighting flows

Frequency and Sample Size

• Surveys conducted every 3 to 7 years
• 10 percent of boardings for systemwide on-board surveys

Cost

• $25 per respondent, typically $1 million for approximately 40,000

responses

Airport ground access surveys should be conducted if feasible.

Method

• Tablet-based intercept of airport trips, possibly with stated preference questions
• Surveys at George Bush Intercontinental and the William P

. Hobby Airports Sampling and Expansion

• Sampling to understand future flight schedules
• Expansion and weighting for air traveler data should use a 10% sample of

airline tickets from reporting carriers or domestic market air carrier statistics.

Frequency and Sample Size

• Conduct ground access surveys every 2 to 3 years

Cost

• $200-$500,000 depending on a range of survey specifications

Commercial vehicle surveys should be collected with smart-phones.

Method

• Smartphone-based surveys
• Roadside intercept, establishment and truck trip diary methods are complementary

Sampling

• 600 and 800 establishments and 2,400 and 3,200 drivers

Frequency and Sample Size

• Incentives can improve response rates
• Should be conducted every 5 to 10 years

Cost

• Establishment surveys that collect either OD data or full driver diary data can be nearly

as resource-intensive as household surveys

Passive data offers robust samples for less cost than surveys.

Passive Data Visitor

Establishment

External

Special Generators Truck

▪ Can be acquired at much less cost than a survey can be conducted ▪ Large samples provide better geographic coverage ▪ Can be expanded to account for biases ▪ Supports modeling for auxiliary travel

We recommend combining surveys and passive data to produce improved observed data for planning.

Surveys

• Household Travel
• Transit
• Airport
• Commercial Vehicle

Passive Data

Visitor Establishment External Special Generator

Auto Truck

Contacts MAREN L. OUTWATER, PE Vice President Maren.Outwater@rsginc.com 619.269.5263