speed

NTSB priority: Roadway speed management

By Eric Sundquist When it comes to speed, delay and congestion usually get more attention than the flip-side problem of excessive speed. Under statute, for example, the federal government requires agencies to track speed reliability and delay. There is no similar requirement for tracking

Speeding contributes to one-quarter of fatalities, but remains culturally acceptable

By Michael Brenneis As a vehicle’s speed increases, it’s kinetic energy increases exponentially. Should a vehicle crash, its kinetic energy is transferred, often catastrophically, into the structure of the vehicle, its occupants, other vehicles, the surrounding built environment, or nearby

Variable speed limits effective along Virginia’s foggy highways

By Chris McCahill Fog can create deadly driving conditions, particularly in mountainous areas like those along I-77 near Virginia’s southern border. Fog along the 12-mile stretch of highway has led to hundreds of crashed vehicles and several deaths over the last couple of decades. In 2016, VDOT

85th percentile speed limits: “Fast, Furious & Fatal”

By Eric Sundquist In 2017, when the City of Los Angeles reviewed operating speeds across its system, it ended up raising speed limits on 89 miles of roadway. Why would a city with a Vision Zero goal raise speed limits in corridors with a history of crashes? Because of a California statute that

Lowering speed limits can reduce crashes

By Chris McCahill Speed limits are often based on observed 85th percentile free flow speeds. Setting them lower, even to address safety concerns, can be difficult once engineering recommendations have been made. A new study, however, bolsters the case for doing so by showing that setting limits

Toward livable streets: A review of recent improvements in practice

By Eric Sundquist In the last decade a number of project development and design guides, such as ITE’s “Designing Walkable Urban Thoroughfares,”  NACTO’s “Urban Street Design Guide,” and city design guide manuals, have emerged. A new article by Eric Dumbaugh of Florida Atlantic

Speeding is akin to an addiction, and roadway design can be an effective treatment

By Eric Sundquist Gerry Forbes, author of the Transportation Association of Canada’s excellent and too-little-known “Speed Management Guide,” suggests in a new ITE Journal article that speeding has some attributes of an addiction. He compares speeding and several addictive substances on

International review confirms speed management is critical to road safety

By Chris McCahill Speed reductions can lower crash risks significantly, confirms a new report by the International Transport Forum, an intergovernmental organization of 59 member countries including the U.S. The research report, Speed and Crash Risk, looks at 11 case studies in 10 different

Report calls for a Safe Systems approach to reduce fatalities

By Robbie Webber A new report from the World Research Institute finds that the most effective way to prevent traffic deaths is a systemic approach that shifts responsibility away from the drivers and other road users to those responsible for roadway planning and designing, land use mix, providing

Florida is leading the nation in lowering speeds to reduce crashes; will other states follow?

By Rayla Bellis Note: This post has been changed to correct erroneous information from another source. The original post stated that speed limits would be changed. FDOT plans to change the design of some roads to encourage slower driving, but not the speed limit on existing roads. The Florida