research report

Autonomous Vehicles in the United States: Understanding Why and How Cities and Regions Are Responding

Abstract

This report analyzes how cities, transit agencies, and metropolitan planning organizations are responding to autonomous vehicles (AVs), both in terms of current testing and pilot services, as well as the long-term implications of broad AV adoption. The report is based on 21 interviews with staff at cities, transportation agencies, MPOs, and select AV companies, as well as extensive document reviews. The research team found a broad spectrum of activity on the part of the public sector regarding autonomous vehicles, as well as a taxonomy of motivations, which ranged from attempting to harness these vehicles to help boost transit ridership, to speeding the adoption of road pricing, increasing density, stimulating technology-sector economic development, generating revenue, and improving pedestrian safety. Agency responses to AV testing vary dramatically – from complex permitting processes and RFPs to intentional delay in developing policy so as not to deter AV activity. Publicly led AV shuttles provide the largest opportunity for municipalities to shape AV testing, while private passenger AV testing and pilot services often provide inadequate information to cities to appraise their operations. A prospective future in which autonomous vehicles make up a large share of travel has led some “early adopter” agencies to develop policies such as partnerships between public transit and AV services, changes to zoning codes to reduce parking requirements in exchange for AV drop-off and pick-up zones, and plans to tax AV passenger trips.

research report

Can Smog Repairs Create Social Justice? The Tune In & Tune Up Smog Repair Program in the San Joaquin Valley

Abstract

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policy brief

The Expansion of California’s Freeway Service Patrol Program is Delivering Benefits to Motorists and the Environment

Abstract

The Freeway Service Patrol (FSP) program has the goal of reducing congestion by using fleets of roving tow and service trucks to quickly clear disabled vehicles and address other minor accidents on California’s freeway. The FSP program is jointly managed by Caltrans, the California Highway Patrol (CHP), and regional transportation agencies. Approximately $21.25 million in State transportation funds are provided each year to eligible regional transportation agencies for the FSP program using a formula-based allocation. The Road Repair and Accountability Act of 2017 (SB 1) directs an additional $25 million per year to the FSP Program in 2017-18 and thereafter. Of this $25 million, $9.05 million is available for allocation to support new or expanded service. To gain a better understanding of the performance and benefits of the FSP program expansion supported by $9.05 million dollars from SB 1, a near-term cost effectiveness evaluation of the program was performed by UC Berkeley researchers affiliated with the Institute of Transportation Studies and the California PATH Program. The evaluation quantified the SB 1 funded benefits in delay savings (e.g., congestion reduction), motorist fuel savings, and transportation-related emissions reduction

research report

Evaluating the Effects of a Classroom-Based Bicycle Education Intervention on Bicycle Activity, Self-Efficacy, Personal Safety, Knowledge, and Mode Choice

Abstract

This study provides an evaluation of the effectiveness of classroom-based adult bicycle education in delivering changes related to bicycling activity, self-perceptions while bicycling, knowledge of the bicycling rules of the road, and mode choice in the San Francisco Bay Area. Evaluation of the intervention was conducted using self-administered surveys completed prior to the intervention and again six weeks after the course. Self-reported data was validated using objective data collected using the Ride Report app. Participants reported statistically significant increases in confidence while bicycling in both traffic and car-free areas, feelings of safety while bicycling in car-free areas, and knowledge of the rules of the road. Participants with initial low confidence increased bicycling activity and feelings of safety in traffic, compared to participants overall. App-collected bicycling data correlated nearly perfectly with self-reported data, suggesting that self-reported data can be used reliably. Classroom-based bicycle education courses are a cost-effective way to change bicycling self-perception and increase knowledge of the bicycling rules of the road.

policy brief

Best Practices for Pavement When did you last review your concrete specifications? Writing concrete mix specifications to improve durability and sustainability

policy brief

Compact, Accessible, and Walkable Communities Help Support Gender Equality

Abstract

In California, Senate Bill 375 mandates regional planning organizations align their transportation plans with sustainable land use and development strategies to achieve reductions in greenhouse gas emissions. In response, the Southern California Association of Governments’ 2016 Regional Transportation Plan/Sustainable Community Strategy directs nearly 50% of housing and employment growth between 2010 and 2040 into walkable and compact neighborhoods within a one-half mile walking distance from well-serviced transit stops. This approach to land use development can encourage shorter driving trips, greater transit usage, and increased walking and cycling as a result of daily activity destinations being clustered near residential and work locations.1Another bi-product and benefit of compact and accessible communities may be improving gender equality related to travel and activity patterns. Prior research shows segregated and dispersed land uses (i.e., suburban sprawl) can exacerbate gender disparities in daily household travel by separating the public and private realms, and can also constrain women to their immediate neighborhoods.2,3 In contrast, neighborhoods with pedestrian accessible mixes-use centers have been shown to help counter social isolation of women in suburbia.4In addition, compact communities with denser land use and better transit service has been shown to reduce the disproportionate amount of chauffeuring women conduct on behalf of the household.

policy brief

Leveraging the Sharing Economy to Expand Shelter and Transportation Resources in California Evacuations

Abstract

In 2017 and 2018, California was severely impacted by a number of devastating wildfires that required thousands of people to evacuate. These evacuations were hampered by poor communication, traffic congestion, and transportation and shelter resource deficiencies. To ensure that all citizens have both transportation and shelter in evacuations, agencies must consider alternative strategies for expanding resources, such as leveraging the sharing economy.

research report

Current State of the Sharing Economy and Evacuations: Lessons from California

Abstract

In many evacuations including wildfire evacuations, public agencies often do not have enough resources to evacuate and shelter all citizens. Consequently, the research team proposes that the sharing economy, through private companies and/or private citizens, could be leveraged in disasters for transportation and shelter resources. To assess this feasibility, the team distributed surveys to individuals impacted by three major wildfires in California: 1) the 2017 October Northern California Wildfires (n=79), 2) the 2017 December Southern California Wildfires (n=226), and 3) the 2018 Carr Wildfire (n=284). Using these data, the researchers find that private citizens are moderately to highly likely to share transportation and sheltering resources in future disasters, but numerous reservations persist about sharing. The team also finds significant spare capacity in evacuating vehicles and potential homes. To supplement this work, the researchers also conducted four focus groups (n=37) of vulnerable populations to determine the benefits and limitations of a sharing economy strategy in terms of equity. Groups included low-income (2017 December Southern California Wildfires), older adults (2017 October Northern California Wildfires), individuals with disabilities (2017 October Northern California Wildfires), and Spanish-speaking (2018 Mendocino Complex Wildfire). The team finds that while severe equity limitations exist, groups were able to develop several recommendations for successfully leveraging sharing economy resources for the general population and their specific vulnerable group. The research paper concludes with several local agencies and statewide recommendations for building a sharing economy framework for California to prepare for future evacuations.

research report

Energy-aware Trajectory Optimization of Connected and Automated Vehicle Platoons through a Signalized Intersection

Abstract

Traffic signals, while serving an important function in coordinating vehicle movements through intersections, also cause frequent stops and delays, particularly when they are not properly timed. Such stops and delays contribute to a significant amount of fuel consumption and greenhouse gas emissions. The recent development of connected and automated vehicle (CAV) technology provides new opportunities to enable better control of vehicles and intersections, which in turn reduces fuel consumption and emissions. In this paper, the research team proposes platoon trajectory optimization (PTO) to minimize the total fuel consumption of a CAV platoon through a signalized intersection. In this approach, all CAVs in one platoon are considered as a whole, that is, all other CAVs follow the trajectory of the leading one with a time delay and minimum safety gap, which is enabled by vehicle-to-vehicle communication. Moreover, the leading CAV in the platoon learns of the signal timing plan just after it enters the approach segment through vehicle-to-infrastructure communication. The team compares the platoon trajectory optimization control with the other two controls, in which the leading vehicle adopts the optimal trajectory (LTO) or drives with maximum speed (AT), respectively, and the other vehicles follow the leading vehicle with a simplified Gipps’ car-following model. Furthermore, the research paper extends the controls to multiple platoons by considering the interactions between the two platoons. The numerical results demonstrate that platoon trajectory optimization has better performance than optimal trajectory and maximum speed, particularly when CAVs have enough space and travel time to smooth their trajectories. The reduction of travel time and fuel consumption can be as high as 40% and 30% on average, respectively, in the studied cases, which shows the great potential of CAV technology in reducing congestion and the negative environmental impact of automobile transportation.

research report

Monitoring the Cost Effectiveness of the Caltrans Freeway Service Patrol (FSP) SB1 Funded Expansion

Abstract

California’s Freeway Service Patrol (FSP) is a congestion mitigation program managed in partnership with metropolitan planning organizations (MPOs), California Highway Patrol, and Caltrans on California’s urban freeways. The program utilizes a fleet of roving tow and service trucks designed to reduce traffic congestion by efficiently getting disabled vehicles running again, or by quickly towing those vehicles off of the freeway to a designated safe location. Quickly removing motorists and their disabled vehicles from the freeway reduces the chances of further incidents caused by onlookers and impatient drivers. In addition, FSP helps save fuel and reduce air-polluting emissions by reducing stop-and-go traffic. California’s Road Repair and Accountability Act (SB 1) invests $5.4 billion annually over the next decade to help fix and repair California’s transportation system.  It will address a backlog of repairs and upgrades while ensuring a cleaner and more sustainable travel network for the future.  California’s Freeway Service Patrol received SB 1 funding to expand its service to motorists across California’s congested freeways. In its first year of implementation (fiscal year 2018-19), SB 1 funded FSP program expansion and provided over 118,000 dollars of assistance to California’s motorists.  The SB 1 funded FSP expansions provided almost $47M dollars in benefits to motorists while costing the State under $9M.  On average, the SB 1-funded FSP expansions provided 5 times as much benefit to California’s motorists as these expansions cost the State.