Travel Survey Recommendations MAREN L. OUTWATER, P .E. Vice President - RSG
Household surveys have improved with smartphone-based GPS data collection. • Household Travel • Transit Surveys • Airport • Commercial Vehicle • Visitor • Establishment Passive Data • External • Special Generator
Household surveys have improved with smartphone-based GPS data collection. GPS captures 20% more trips than diary-based > methods Multi-day surveys capture unique trips > > 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. Toll User Intercept Future Mobility University Conduct attitude and Attitudes Student preference surveys and Travel Survey university Preferences regarding Household students via email Travel autonomous vehicles with university cooperation Ride-hailing and Bicycle User Carshare Intercept Travel
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. ▪ Can be acquired at much less cost Visitor than a survey can be conducted ▪ Large samples provide better Establishment geographic coverage ▪ Can be expanded to account for Passive Data biases ▪ Supports modeling for auxiliary travel Truck External Special Generators
We recommend combining surveys and passive data to produce improved observed data for planning. • Household Travel • Transit Surveys • Airport • Commercial Vehicle Visitor Establishment External Special Passive Generator Auto Data Truck
Contacts MAREN L. OUTWATER, PE Vice President Maren.Outwater@rsginc.com 619.269.5263
Recommend
More recommend
