National Center for Smart Growth

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Assessing the impact of urban form measures in nonwork trip mode choice after controlling for demographic and level-of-service effects
(2003) Rajamani, Jayanthi; Bhat, Chandra R.; Handy, Susan; Knaap, Gerritt; Song, Yan
The relationship between travel behavior and the local built environment continues to be a contentious issue, despite several research efforts in the area. The current paper investigates the significance and explanatory power of a variety of urban form measures on nonwork activity travel mode choice. The travel data used for analysis is the 1995 Portland Metropolitan Activity Survey conducted by Portland Metro. The database on the local built environment was developed by Song (2002) and includes a more extensive set of variables than previous studies that have examined the relationship between travel behavior and the local built environment using the Portland data. A multinomial logit mode choice model results indicate that higher residential densities and mixed-uses promote walking behavior for nonwork activities.
Internally Connected, No Commercial, With a Touch of Open Space: The Neighborhoods of New Homes in the Portland Metropolitan Area
(2004) Song, Yan; Knaap, Gerrit
For many years, neighborhoods have been classified as either “suburban” or “traditional.” But new homes today are built in many different types of neighborhoods with many different design features. In this paper, we develop a quantitative method for classifying the neighborhoods of new homes in the Portland metropolitan area. We proceed in three steps. First we measure urban form attributes of neighborhoods around newly developed homes. We then use factor analysis to identify a small set of factors that capture essential differences in urban form. Finally we use cluster analysis on these factor scores to identify distinctly different neighborhood types. Applying these methods to neighborhoods around new single family homes in the metropolitan Portland, Oregon, we are able to identify eight factors of urban form and six neighborhood types. We then show that most new single family homes in metropolitan Portland are built in new suburban neighborhoods but a substantial portion is occurring in traditional urban neighborhoods.
The Transportation-Land Use Policy Connection
(2005) Knaap, Gerrit; Song, Yan
In this paper, we explore the transportation-land use policy connection. More specifically, we consider the question: can land use policy be used to alter transportation behavior? The answer is of some importance. If the answer is yes, then there is hope that land use policies can be designed and implemented that will bring some relief to the gridlock and complex transportation problems facing US metropolitan areas. This is the underlying assumption behind most smart growth policy reforms. If the answer is no, then land use policy may still be important, but is not likely to play an important role in resolving transportation issues. We proceed as follows. First we offer a schematic that identifies necessary conditions for land use policy to play a role in addressing transportation issues. Specially,we argue that for land use policy to play an effective role, three conditions must hold. First, land use must be able to alter transportation behavior. Second, transportation infrastructure must not fully determine land use. Third, the condition on which we consider most extensively, land use policy must significantly and constructively affect land use. After presenting the schematic, we consider the evidence on each of these conditions. Based on our review of the evidence, we conclude that land use policy can play an effective role in addressing transportation issues, but that the role is likely to be small, often counter productive, and most effective at the neighborhood scale.
The Fruits of Growth Management in the Sunshine State: An Examination of Urban Form in Orange County, Florida
(2005) Knaap, Gerrit; Song, Yan
The state of Florida is nationally recognized as a leader in urban growth management. In 1972, Florida’s legislature passed a host of statutes aimed at addressing the increasingly apparent strains on the natural environment caused by then uncontrolled development. The Florida Environmental Land and Water Management Act of 1972 was based on the American Law Institute Model Land Development Code, and created a new regulatory process for “developments of regional impact” (DRIs) in those jurisdictions with local land use controls (FLA. STAT. §§ 380.06, 380.012 et seq.). It also provided for designation of environmentally sensitive “areas of critical state concern,” which entailed stringent state oversight of development (FLA. STAT. § 380.05). Other legislation passed that year include the Florida Water Resources Act of 1972, which created regional water management districts, and the Land Conservation Act of 1972, which authorized the Governor and Cabinet to buy environmentally endangered lands and land for outdoor recreational use (FLA. STAT. §§ 373.013 et seq., 259.01 et seq.). Specifically related to land use planning, the Florida State Comprehensive Planning Act of 1972 required the Governor to prepare a State Comprehensive Plan, which would articulate goals and policies to guide Florida’s future growth following enactment by the legislature (FLA. STAT. § 186.001 et seq.)

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