Narrow lanes are safer, but they can be extremely difficult to build

A study released by Johns Hopkins last November gained widespread attention for demonstrating that 9-foot lanes are often safer than wider lanes. The researchers note, however, that most state DOTs set minimum lane widths between 10 and 12 feet and require design exceptions for anything narrower. Even in Vermont, where 9-foot lanes are allowed, the researchers found they have not been implemented. Therefore, paving the way to narrow lanes means understanding all the factors that make them challenging in the first place. 

Success driving less

Driving less is one of the keys to reducing greenhouse gas emissions from the transportation sector, and to reducing the number of deaths and serious injuries on our roads. Most states have seen an increase in per capita vehicle miles traveled over the last 25 years. There are exceptions, however, where political action, multimodal investment, or the development of compact neighborhoods acted to pull VMT numbers down, says a new report by the Frontier Group.

Low-income communities can benefit most from accessible cities

America’s outward, car-oriented growth has meant that people now travel much farther for basic needs. According to new research, only 12.1% of trips to basic amenities happen within a 15-minute walking radius of residents’ homes in the median U.S. neighborhood, and the frequency of those types of trips varies greatly depending on income.

Big data: allowing cities to evaluate infrastructure investments before and after installation

Infrastructure planning processes have long been forced to rely on expensive and time-consuming methods of data gathering or, in some cases, anecdotal evidence and hypothetical arguments from both project supporters and opponents. Fortunately, thanks to the increased availability of location data, cities are beginning to add important quantitative measures to their decision-making process, including the opportunity to analyze the conditions before and after a project is installed.

Light rail and complementary development have broad effects on travel behavior

The goal of investing substantially in public transportation infrastructure and complementary transit oriented development (TOD) is to create positive outcomes for communities, including reducing carbon emissions, increasing access to jobs, and reducing reliance on personal vehicles. Two new studies highlight additional impacts of these investments; transit infrastructure leading to increased levels of physical activity and TOD residents forgoing driving for non-commute trips. 

Facilities for walking and biking can increase safety, but intersections still lag

The death of a well-known cyclist in Phoenix, Arizona, persuaded the city DOT to scrap changes it had proposed for an essential local street, in favor of protected bike lanes. As the Phoenix New Times reported, the death of a cyclist and downtown ambassador in central Phoenix galvanized supporters to call for protected bike lanes in the area of the crash. The city Street Transportation Department moved away from installing lanes shared by drivers and bicyclists, to painted, buffered bicycle lanes, and, on some blocks, fully protected bike lanes.

Utah and Washington DOTs measure connectivity across highways under recent federal pilot program

The state DOTs in Washington (WSDOT) and Utah (UDOT) recently developed methods to evaluate the comfort, safety, and connectivity of active transportation networks, focusing on bicycle and pedestrian connectivity across highways. The studies leverage newer data sources and GIS techniques to think about how highways can create barriers for nearby communities and how major corridors can be made more permeable.

Bike facilities often follow income gains, not the other way around

A new study found little evidence that new bike infrastructure leads to displacement of low-income households or people of color, despite the two sometimes being linked in public discourse. The data reveal some bias toward mostly white neighborhoods in terms of where new facilities are installed, but sharrows, or markings that indicate a preferred bicycle route, account for more of the difference than separated bike lanes.

Big Data sources for understanding non-motorized travel patterns

Although, there are many platforms and companies offering bike-ped travel data acquired through smartphone apps, location-based services, fitness apps, etc., the choice can be very confusing and at times expensive. A recent paper from Texas A&M Transportation Institute discusses the top sources for this travel data. This could help us understand how to solve the complexities of incorporating active transportation modes into traditional planning practices.

Can travel demand models predict cycling?

Try asking a conventional travel demand model about bicycle trips and you might get anything from an educated guess to an error message. A recent study from Sweden, however, shows what it takes to fix them. The short answer is to make the models much bigger. That leaves an important question: is it worth it?