The increased proximity provided by more compact and centralized development is about ten times more influential than vehicle traffic speed on the number of destinations that people can reach within a given travel time.
Researchers analyzed the number of destinations that can be accessed within a given amount of travel time by mode (automobile and transit) and purpose (work and non-work trips) for about 30 US metropolitan areas. They found that although denser urban development tends to reduce vehicle travel speeds, the increased proximity is about ten times more influential than travel speed in determining a metropolitan area’s overall accessibility. This indicates that smart growth policies which increase development density and mix, transport network connectivity, and transport system diversity can do more to improve overall transport system performance than efforts to increase traffic speeds and reduce congestion.
The authors conclude, "Having destinations nearby, as when densities are high, offers benefits even when the associated congestion slows traffic. Where land use policy frequently seeks to support low-development densities in part in an attempt to maintain travel speeds and forestall traffic congestion, our findings suggest that compact development can often improve transportation outcomes."
Toward More Comprehensive Understanding of Traffic Congestion
Conventional planning tends to consider traffic congestion asignificant cost and roadway expansion the preferred solution. It evaluates transport system performance based on indicators such as roadway Level of Service (LOS) and peak-period traffic
Planning for Accessibility: Proximity is More Important than Mobility
Accessibility-based planning minimizes the distance that people must travel to reach desired services and activities. Measured this way, increased density can provide more total benefits than increased speeds.
An International Comparison of Transportation Modes
Access (the ease of reaching desired destinations) is a key factor in transport, sustainability, and urban planning. This new study applies multimodal accessibility analysis to 4 modes in 117 cities in 6 countries, illustrated graphically.
Depopulation Patterns Get Weird
A recent ranking of “declining” cities heavily features some of the most expensive cities in the country — including New York City and a half-dozen in the San Francisco Bay Area.
California Exodus: Population Drops Below 39 Million
Never mind the 40 million that demographers predicted the Golden State would reach by 2018. The state's population dipped below 39 million to 38.965 million last July, according to Census data released in March, the lowest since 2015.
Chicago to Turn High-Rise Offices into Housing
Four commercial buildings in the Chicago Loop have been approved for redevelopment into housing in a bid to revitalize the city’s downtown post-pandemic.
How California Transit Agencies are Addressing Rider Harassment
Safety and harassment are commonly cited reasons passengers, particularly women and girls, avoid public transit.
Significant Investments Needed to Protect LA County Residents From Climate Hazards
A new study estimates that LA County must invest billions of dollars before 2040 to protect residents from extreme heat, increasing precipitation, worsening wildfires, rising sea levels, and climate-induced public health threats.
Federal Rule Raises Cost for Oil and Gas Extraction on Public Lands
An update to federal regulations raises minimum bonding to limit orphaned wells and ensure cleanup costs are covered — but it still may not be enough to mitigate the damages caused by oil and gas drilling.
City of Costa Mesa
Licking County
Barrett Planning Group LLC
HUD's Office of Policy Development and Research
Mpact Transit + Community
HUD's Office of Policy Development and Research
City of Universal City TX
ULI Northwest Arkansas
City of Laramie, Wyoming
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
