research report

The Induced Travel Calculator and Its Applications

Abstract

The National Center for Sustainable Transportation’s Induced Travel Calculator (Calculator) has generated substantial interest in the professional community as a method for estimating the additional vehicle miles traveled (VMT) induced by expanding the capacity of major roadways. The Institute of Transportation Studies at the University of California, Davis (ITS-Davis) initiated a technical assistance project to support Caltrans and others in applying the Calculator. This report: (1) provides an overview of the Calculator and the induced vehicle travel effect, (2) summarizes the results from an earlier study comparing the Calculator’s estimates with other induced travel analyses, (3) describes the technical assistance efforts and outcomes, and (4) discusses plans for future improvements to the Calculator. During the project, ITS-Davis advised Caltrans as it developed its Transportation Analysis Framework to guide transportation impact analysis for projects on the State Highway System. Caltrans published the final document in September 2020, in which it recommends that the Calculator be used where possible to estimate induced VMT. ITS-Davis also advised on efforts to apply the Calculator’s elasticity-based method to estimate induced VMT from out-of-state highway capacity expansion projects, including projects in Portland, Oregon, Washington, D.C., Kenya, and China. In a follow-up project, ITS-Davis will work with Caltrans to improve the Calculator documentation to answer questions raised by Caltrans and others, explore possible technical improvements to the Calculator, and explore opportunities for assessing the validity of the Calculator’s induced VMT estimates.

research report

Early Results from an Electric Vehicle Carsharing Service in Rural Disadvantaged Communities in the San Joaquin Valley

Abstract

In rural areas, cost-effective transit service is challenging to provide due to greater travel distances, lower population densities, and longer travel times than in cities. The people who rely on public transit contend with infrequent and slow service. Access to a personal car is often essential to the quality of life for most residents, enabling them to more easily access work, health care, education, healthy food, and other essential services. However, keeping two (or sometimes even one) cars in reliable working order can consume an estimated 22% to 56% of the household budget for low-income families in California. Rural residents often have lower incomes than their urban counterparts, and the most fuel-efficient vehicles, particularly electric vehicles (EVs), are often outside their financial reach. An EV carsharing pilot, called Míocar, was launched in August 2019 to explore the potential of a shared mobility service to offer a cost-effective mobility option for residents of rural disadvantaged communities and to help reduce greenhouse gas emissions. Affordable housing complexes host the round-trip EV carsharing hubs in southern San Joaquin Valley (CA) communities with low levels of intercity transit service and personal vehicles. The goals of the pilot program are (a) to provide carsharing at a price point that is more affordable than owning a personal vehicle to price-sensitive populations with low transit access, and (b) to help reduce greenhouse gas emissions. This report summarizes the data collected during the 10-month operational ramp-up of the Míocar service—the entire dataset links members and their service use data with results from member and post-reservation surveys. The results provide initial insights into who, how, and why members are using Míocar.

research report

To Pool or Not to Pool? Understanding the Time and Price Tradeoffs of OnDemand Ride Users – Opportunities, Challenges, and Social Equity Considerations for Policies to Promote Shared-Ride Services

Abstract

On-demand mobility services including transportation network companies (also known as ridesourcing and ridehailing) like Lyft and Uber are changing the way that people travel by providing dynamic mobility that can supplement public transit and personal-vehicle use. However, TNC services have been found to contribute to increasing vehicle mileage, traffic congestion, and greenhouse gas emissions. Pooling rides ⎯ sharing a vehicle by multiple passengers to complete journeys of similar origin and destination ⎯ can increase the average vehicle occupancy of TNC trips and thus mitigate some of the negative impacts. Several mobility companies have launched app-based pooling services in recent years including app-based carpooling services (e.g., Waze Carpool, Scoop) that match drivers with riders; pooled on-demand ride services (e.g., Uber Pool and Lyft Shared rides) that match multiple TNC users; and microtransit services (e.g., Bridj, Chariot, Via) that offer on-demand, flexibly routed service, typically in larger vehicles such as vans or shuttles. However, information on the potential impacts of these options is so far limited. This research employs a general population stated preference survey of four California metropolitan regions (Los Angeles, Sacramento, San Diego, and the San Francisco Bay Area) in Fall 2018 to examine the opportunities and challenges for drastically expanding the market for pooling, accounting for differences in emergent travel behavior and preferences across the four metropolitan regions surveyed. The travel profiles, TNC use patterns, and attitudes and perceptions of TNCs and pooling are analyzed across key socio-demographic attributes to enrich behavioral understanding of marginalized and price sensitive users of on-demand ride services. This research further develops a discrete choice model to identify significant factors influencing a TNC user’s choice to pool or not to pool, as well as estimating a traveler’s value of time (VOT) across different portions of a TNC trip. This research provides key insights and social equity considerations for policies that could be employed to reduce vehicle miles traveled and emissions from passenger road transportation by incentivizing the use of pooled on-demand ride services and public transit

conference paper

A Reprieve from US Wildlife Mortality on Roads during the COVID-19 Pandemic

Abstract

In 2015, the Road Ecology Center at UC Davis developed a web-based method to collect all incident data that appear on the CHP real-time incident-reporting website (https://cad.chp.ca.gov/). These data are assembled into a database called CHIPS, the California Highway Incident Processing System. Previous analyses suggest that these data are more spatially accurate than other state resources (e.g., the Statewide Integrated Traffic Records System (SWITRS)). Because they are collected and organized in real time, they can also be shared and queried more easily. The current project developed a web portal that supports queries for counties and specific highways (https://roadecology.ucdavis.edu/resources/covid19- traffic). The results shown make apparent the reduction in crashes and traffic during the summer 2020 peak of the COVID-19 pandemic.

conference paper

Automated harvesting and display of WVC and crash data in California

Abstract

In 2015, the Road Ecology Center at UC Davis developed a web-based method to collect all incident data that appear on the CHP real-time incident-reporting website (https://cad.chp.ca.gov/). These data are assembled into a database called CHIPS, the California Highway Incident Processing System. Previous analyses suggest that these data are more spatially accurate than other state resources (e.g., the Statewide Integrated Traffic Records System (SWITRS)). Because they are collected and organized in real-time, they can also be shared and queried more easily. The current project developed a web-portal that supports queries for counties and specific highways (https://roadecology.ucdavis.edu/resources/covid19- traffic). The results shown make apparent the reduction in crashes and traffic during the summer 2020 peak of the COVID19 pandemic.

research report

Resiliency Impacts of Plug-in Electric Vehicles in a Smart Grid

Abstract

This project assesses the impact of plug-in electric vehicles (PEVs) on the resiliency of the electricity distribution system by: (1) Assessing the use of PEVs as a resiliency resource during grid outages (Mobility Services+), (2) Assessing and simulating the impact of PEVs on the distribution infrastructure during normal operations, and (3) Determining the local environmental impact of clustering PEVs. A previously developed model of a smart grid consisting of two distribution circuits and a distribution substation was modified to enable the use of PEVs in vehicle-to-home (V2H) and vehicle-to-grid (V2G) configurations. Scenarios were simulated in which PEVs were used to serve critical loads in a home or community shelters, and a model was developed to assess the feasibility of using PEVs in grid restoration, which determined the inrush current of the substation transformer to determine the required power and energy for startup. The use of clustered PEVs and scattered PEVs in grid restoration was also considered. During normal operations, the stress on system components from high PEV demand resulted in accelerated aging and possible failure, thereby negatively impacting distribution infrastructure during normal grid operations. Smart charging is required to retain an acceptable level of resiliency. In contrast, during grid outages, this study demonstrated that PEVs can be used as an environmentally friendly resiliency resource to both serve critical loads and facilitate grid restoration with the qualification that implementation requires system upgrades including smart switches, upgraded inverters, energy management systems, and communication links.

policy brief

COVID-19 has Significantly Impacted the Mobility and Activities of the Senior Population in Contra Costa County

Publication Date

December 1, 2020

Author(s)

David Ragland, Glenn Schorr, Grace Felschundneff

Abstract

Meeting the mobility needs of an aging population is one of the most substantial challenges facing California in the coming decades. The number of residents age 60 and above will grow to 13.9 million by 2050, representing over 25% of the state population. Meanwhile, the number of residents age 85 and above is expected to increase by over 70% between 2010 and 2030. In 2018, the Safe Transportation Research and Education Center (SafeTREC) at UC Berkeley conducted a survey on transportation mobility issues among older adults in Contra Costa County in California. Results indicated, among other findings, that a majority of seniors are car dependent, that some older adults miss important activities due to mobility limitations, and that most older adults want to “age in place.” A follow-up survey of 302 Contra Costa County seniors ages 60 and above was conducted in June 2020, just as the COVID-19 pandemic changed life for all residents. The follow-up survey assessed the mobility needs and changes during the Shelter-in-Place order as well as how COVID-19 was impacting other areas of their lives, such as their economic situation, views of government regulatory efforts, feelings of social isolation, and work/employment status. This brief presents findings from the follow-up survey.

policy brief

Public Transit and Shared Mobility COVID-19 Recovery: Policy Recommendations and Research Needs

Abstract

While the COVID-19 crisis has devastated many public transit and shared mobility services, it has also exposed underlying issues in how these services are provided to society. As ridership drops and revenues decline, many public and private providers may respond by cutting service or reducing vehicle maintenance to save costs. As a result, those who depend on public transit and shared mobility services, particularly those without access to private automobiles, will experience further loss of their mobility. These transportation shifts will be further influenced by changing work-from-home policies (e.g., telework). While uncertainty remains, work-from-home will likely alter public transit and shared mobility needs and patterns, necessitating different services, operation plans, and business structures.

research report

Homelessness in Transit Environments Volume I: Findings from a Survey of Public Transit Operators

Publication Date

December 17, 2020

Author(s)

Abstract

More than half a million individuals experience homelessness every night in the U.S. With the scale of the crisis often surpassing the capacities of existing safety nets—all the more so since the onset of the COVID-19 pandemic—many turn to transit vehicles, stops, and stations for shelter. Many also use transit to reach destinations such as workplaces, shelters, and community service centers. This report investigates the intersections of the pandemic, transit, and homelessness, presenting the results of a survey of 115 transit operators on issues of homelessness in their systems. The research team finds that homelessness is broadly present across transit systems, though concentrated on larger operators and central hotspots, and has reportedly worsened in transit during the pandemic. The perceived challenges of homelessness are deepening, and data, dedicated funding, and staff are rare. However, a number of responses, including external partnerships and outreach and service provision, are growing, and agencies are adapting quickly to the pandemic. All told, centering the mobility and well-being of unhoused riders fits within transit’s social service role and is important to improving outcomes for them and for all riders.