"Traffic calming is the combination of mainly physical measures that reduce the negative effects of motor vehicle use, alter driver behavior and improve conditions for non-motorized street users." -Institute for Transportation Engineers, Traffic Calming: State of the Practice
View case studies and examples of flexible design elements in practice around the U.S. and internationally. This section features hundreds of case studies and images of road-design elements like barriers, bicycle facilities, crosswalks, curb extensions, medians, parking, shoulders, sidewalks, transit facilities, and more.
This section details road-design typologies that can be used to accomplish goals such as encouraging multi-modal use, improving access and mobility, and decreasing vehicle speeds. For example, communities are converting one-way streets back to two-way in order to reduce vehicle speeds and improve access to downtowns and neighborhoods, giving up the advantages of one-way streets in terms of vehicle flow. Major roads and arterials are being retrofitted to include elements similar to traditional urban boulevards in order to encourage more multi-modal use of the road as well as assure that the road is a complement to newly planned development. Because traffic congestion is generally created when local traffic is all funneled onto the same major road, road networks are being created to help improve mobility and access by giving options to drivers, pedestrians with different needs, and bicyclists to avoid a major road.
Which are the world's best streets, and what are the physical, designable characteristics that make them great? To answer these questions, Allan Jacobs has surveyed street users and design professionals and has studies a wide array of street types and urban spaces around the world. With more than 200 illustrations, all prepared by the author, along with analysis and statistics, this book offers a wealth of information on street dimensions, plans, sections, and patterns of use, all systematically compared.
Livable Streets Revisited
This article evaluates the livability of residential boulevards, a type of street that has center lanes for through traffic and local access lanes separated from the center lane by landscaped "malls." Three boulevards were studied. All three carried high traffic volumes, but were rated as more livable than neighboring, conventionally designed streets with medium traffic volumes. The study concludes that boulevards with a side medium design successfully mitigate the impacts of traffic.