policy brief

Best Practices for Pavement: Is your asphalt only living half as long as it could? Writing and enforcing specifications for asphalt compaction

research report

Policy and Literature Review on the Effect Millennials Have on Vehicle Miles Traveled, Greenhouse Gas Emissions, and the Built Environment

Abstract

Vehicle travel has reduced substantially across all demographics in the 2000s, but millennials or young adults born between 1985-2000 stand out as the group that has reduced vehicle travel the most. This reduction of travel among millennials is known as the millennial effect. This policy and literature review discusses insights from recent policy reports and literature regarding the millennial effect and identifies the prominent themes and gaps in knowledge. The first section reviews existing research on the millennial effect on vehicle miles traveled (VMT). The second section discusses the influence of the built environment on the travel and activities of the millennial generation. The third section highlights scenarios describing the millennial effect’s potential magnitude and identifies topics for consideration in future scenario planning efforts. The final section discusses the uncertainty that exists regarding the future behavior of millennials and their influence on vehicle miles traveled and greenhouse gas emissions.

policy brief

Advanced Low-NOx Compressed Natural Gas Engines in Medium- and Heavy-Duty Vehicles Are Poised to Deliver Air Quality Benefits and Advance California’s Climate Goals

Abstract

Recent commercialization of advanced low-nitrogen oxides (NOx) Compressed Natural Gas (CNG) engines for medium- (MDV) and heavy-duty (HDV) vehicles has garnered significant interest due to the potential air quality benefits. Further, utilizing renewable natural gas (RNG) in advanced CNG engines from sources such as biomass and/ or biogas can achieve reductions in greenhouse gas (GHG) relative to using petroleum fuels and fossil CNG. However, the regional air quality and GHG reduction benefits of large‐scale deployment of advanced CNG trucks are currently unclear. Further, more information is required regarding RNG production potential from California instate biofuel resources, including potential supply volumes and production pathways that provide maximum GHG reductions. The UC Irvine Advanced Power and Energy Program assessed the air quality and GHG implications of transitioning to advanced CNG engines in MDVs and HDVs in California by developing and comparing different future adoption scenarios. The research team also leveraged prior research of biogas and biomass resources in California to consider different options for producing RNG in-state. Key findings from this research are highlighted in the following section.

policy brief

Crystal Balls and Black Boxes: Policy Effects on Optimism in Ridership and Cost Forecasts for New Starts Rapid Transit Projects

Abstract

Several studies have observed an optimism bias in cost and ridership forecasts for rapid transit projects around the globe (Flyvbjerg, Skamris Holm, and Buhl 2005; Kain 1990; Richmond 2005; Lewis-Workman et al. 2008; Pickrell 1992), which has led to billions of dollars of public investment in projects that have not performed as promised — in terms of either cost or ridership, and usually both. This bias has been a major cause of concern for project stakeholders, including the Federal Transit Administration (FTA), which spends about two billion dollars per year on new rapid transit projects in the United States through its Capital Investment Grants program, commonly known as New Starts. Partly in response to credibility concerns raised by forecast bias, the FTA has made changes to the New Starts program over the years both to increase forecast accuracy and reduce reliance on forecasts in selecting projects for funding. Such changes include a requirement for ex post analyses of cost and ridership for completed projects and the introduction of several new criteria in addition to cost and ridership to evaluate proposed projects — such as anticipated environmental benefit and transit-supportive land use policies. Unfortunately, there has been no research to date that has examined how these changes in Federal policy have influenced forecast accuracy for rapid transit projects that receive New Starts funding.

policy brief

Mapping Roadkill to Improve Driver and Wildlife Safety on Highways

Abstract

Wildlife-vehicle collisions (WVC) pose a risk to drivers and cost U.S. society billions of dollars annually in property damage, emergency response, maintenance and mitigation, and lost economic activity. Reducing WVC requires identifying where these collisions are most common and what activities improve safety and protect wildlife. Collecting data on the extent and nature of WVC incidents is a challenge, however. Currently, Caltrans maintenance staff record their activities on paper in the field and then transcribe that information to a digital system when they return to the maintenance stations and regional offices. This system not only makes it challenging for individual staff to keep track of activities, it also reduces the chance that valuable information (like WVC location and wildlife species) will be retained and transcribed correctly.To improve data collection, the Road Ecology Center at UC Davis is developing tools such as a “one click” mobile app which will help Caltrans workers and others to collect WVC data in the field, with greater locational accuracy. The app will also enable Caltrains maintenance staff, who are often first responders to non-emergency roadside incidents, to track illegal dumping and as well as record roadside vegetation issues (e.g., areas that need mowing, weed-control, planting) and note fire hazards.

policy brief

Activity Patterns of Heavy-Duty Vehicles and Their Implications on Energy Use and Emissions

Abstract

Heavy-duty vehicles comprise a variety of vocations whose distinct operational requirements create different activity patterns. Understanding these differences will allow development of appropriate energy and emission reduction strategies.For instance, many heavy-duty diesel vehicles employ the selective catalytic reduction (SCR) to meet the new 2010 emission standards for nitrogen oxides (NOX). Typically, SCR needs to be at least 200 OC before significant NOX reduction is achieved. Some activity patterns may increase the frequency with which this temperature requirement is not met such as during start-up and idling.Similarly, the electrification of heavy-duty vehicles is a promising pathway for energy independence and emissions reduction but is complicated by the trade-off between battery size and the driving range necessary for specific operating goals. Detailed knowledge of activity patterns can therefore inform what vocational uses of these vehicles are suitable candidates for electrification.

policy brief

State-Level Policies for Reducing Vehicle-Miles Traveled

Publication Date

May 1, 2017

Author(s)

Susan Handy, Michelle Byars, Yishu Wei

Abstract

California has set ambitious goals for reducing its greenhouse gas emissions to 40% below 1990 levels by 2030 and 80% below 1990 levels by 2050. To meet these goals, the state must achieve a 15 percent reduction in total travel by light-duty vehicles by 2050 compared to expected levels. Under current state policies, reductions of this magnitude are unlikely.
Strong empirical evidence supports strategies across four categories that can reduce vehicle miles of travel (VMT) (1) pricing, (2) infill development, (3) transportation investments, and (4) travel demand-management programs. The state can directly implement some of these strategies, particularly pricing strategies, through state-level policies. Others depend on actions by regional and local governments, though state-level policies can encourage their implementation through incentives, requirements, or other mechanisms.

policy brief

Spatio-temporal Road Charge: a Potential Remedy for Decreasing Local Streets Congestion

Abstract

In the early ages of the mobile Internet, routing apps appeared as a viable tool for the few
motorists equipped with an in-vehicle navigation system or an aftermarket navigation
device. With market penetration increasing, and recent market consolidation, a few
companies are now the sole providers of driving directions to the majority of the
US population. Additionally, the emergence of large ridesourcing or transportation
network companies (TNCs) totaling up to tens of thousands of registered drivers in
single cities (all using the same routing app), there is further consolidation. Across
the US, this has led to new or increased congestion patterns that are progressively
asphyxiating local streets due to so-called “cut-through traffic.”
As neighborhoods have started to realize this, private citizens have begun to resist,
by trying to sabotage or trick the apps, or shaming the through traffic through
opinion articles, and news stories, and other methods. Municipal agencies/planners
are pursuing more institutionalized ways to handle the situation, adding stop signs,
speed bumps, and turning restrictions to make local traffic slower in the hope that
the apps will “learn” not to send through-traffic to their neighborhoods (since apps
systematically provide the route most beneficial to the user, not necessarily to the
community). In other countries, lawsuits from cities against these app providers have
already started, potentially forecasting similar approaches in the US.

policy brief

A California Feebate Program Can Support Transition to Zero Emission Vehiles at No Cost to Taxpayers

Abstract

The State of California has developed a range of programs to accelerate the adoption of zero-emission vehicles (ZEV). California’s ZEV mandate will require 15% of vehicles sold in the state to be ZEV or transitional ZEV (TZEV) by 2025i. To encourage purchases of these vehicles, California established the Clean Vehicle Rebate Project (CVRP), which provides consumer rebates of $5,000 for fuel cell vehicles, $2,500 for battery electric vehicles, and $1,500 for plug-in hybrid electric vehiclesii. The federal government also provides a $7,500 tax credit to purchasers of qualifying electric vehicles. As ZEV sales increase, the amount of funding needed to provide rebates would need to increase as well at a cost to taxpayers under the current incentive structure. For example, selling one million battery electric vehicles in California will result in a cost of $10 billion to taxpayers (i.e., $10,000 in combined federal and state incentives multiplied by one million).
Markets and regulations are also getting out of alignment. Vehicle fuel economy and greenhouse gases (GHG) standards are becoming more stringent as oil prices are staying low. If gasoline prices stay low, as seems likely (thanks in part to tightening vehicle standards in US, Europe, and elsewhere), then consumers will have little incentive to buy a more expensive, fuel-efficient car. As vehicle fuel and GHG standards get become even more stringent, the misalignment will worsen.

policy brief

Connected and Automated Vehicle Policy Development for California

Abstract

Connected and automated vehicles (CAV) have the potential to confer large benefits to California in economic development (job creation) and in improving the operation of its road transportation network. CAV systems are likely to become one of the most important application domains for modern information technology, employing large numbers of highly skilled people in research, development and implementation wherever the companies that are developing these systems find the local environment most hospitable. The CAV systems are expected to produce significant improvements in roadway capacity, traffic flow smoothness, driving comfort and convenience, energy efficiency, pollution reduction and traffic safety.Realizing those benefits will require a serious investment of attention and resources by the State, because these technologies need nurturing to facilitate their deployment. The required actions include a mixture of investments in developing the needed knowledge base and in establishing an appropriate policy framework.