Density

Jarrett Walker, author of "Human Transit: How Clearer Thinking about Public Transit Can Enrich our Communities and Lives," writes about the costs and benefits of microtransit on his blog, "Human Transit". Walker is skeptical of Microtransit. He argues that it is spacially, economically, and fiscally inefficient and should only be used in very rare and specific cases.

This study aims to quantitatively estimate the environmental benefits of bike sharing. Using big data techniques, we estimate the impacts of bike sharing on energy use and carbon dioxide (CO2) and nitrogen oxide (NOX) emissions in Shanghai from a spatiotemporal perspective.

"In this paper we put together a list of the basic instincts that drive and contain travelers' behavior, showing how they mesh with technological progress and economic constraints."

"This memorandum outlines the process, objectives, and findings of an analysis the City of Portland Bureau of Planning and Sustainability (BPS) engaged Economic & Planning Systems (EPS) to undertake regarding whether proposed density bonuses would create sufficient additional residual land value to compensate for newly-established regulatory requirements in Multi-Dwelling Unit zone districts."

This article studies the relationship between gasoline consumption and urban design patterns by comparing 32 principal cities from around the world. The purpose is to evaluate physical planning policies for conserving transportation energy in urban areas.

This report discusses 761 walkable urban places in the United States' 30 largest metropolitan areas and their impact on social equity and educational attainment, and their economic impact on office, retail, and housing land uses.

The city of Chandler, Arizona is preparing for autonomous vehicles’ impact on parking by allowing developers to provide less parking if they provide accommodations for ride-sharing and autonomous vehicles.

Buffalo has become to first major city to completely remove its outdated minimum parking requirements citywide.

U.S. Census estimates through 2017 indicate a revival of suburbanization and migration towards metro areas in the middle of the country.

This EPA webpage explains surface and atmospheric heat islands, and compares conditions at different times of day and in urban vs. rural areas.

In Seattle, a suburban shopping center’s parking lot is being transformed into a new walkable neighborhood.

“This research examines office parking at a series of case study sites in suburban Southern California, identifying its impact on travel behavior, development density, development cost, and urban design.”

The relationship between transit success and density is one that should be considered when planning transportation. Transit lines need to consider cost per passenger-mile in order to ensure financial feasibility. Some scholars suggest minimum density thresholds for successful transit of different types, but these rules do not always represent accurate ridership numbers. However, higher density in cities generally makes transit more feasible.

2019 saw a record number of retail store closings, however the actual retail square footage was not proportionally impacted. This emerging trend is due to smaller tenants opening more stores and retailers shedding space in order to improve sales productivity.

The goal of this white paper is to consider the impact of AVs on municipal budgets. AVs create a “potential rat’s nest of a budgeting challenge.” This paper seeks to begin the process of untangling that rat’s nest, and provide the foundation for future phases of the project that will consider potential additional revenue sources to fund the infrastructure changes that may come from the integration of AVs as well as land use planning implications.

The invention of the internet introduced a new typology to the marketplace, the online retailer. Omnichannel retail strategies - where a retailer operates through both physical locations and online sales - have become a necessity in today’s market.

Autonomous vehicles (AVs) are a near future reality and the implications of AVs on city development and urban form, while potentially widespread and dramatic, are not well understood. This report describes the first order impacts, or the broad ways that the form and function of cities are already being impacted by forces of change including⁠—but not limited to⁠—AVs and related technologies.

Today, warehouses are transforming into massive “mega-distribution centers” located in increasingly suburban areas. However, the rapid delivery expectations of E-commerce will also perpetuate the need for a network of local, smaller-scale supply points.

Open source simulation platform for supporting planning and analysis of urban development, incorporating the interactions between land use, transportation, the economy, and the environment.

A blueprint for designing 21st century streets, the Guide unveils the toolbox and the tactics cities use to make streets safer, more livable, and more economically vibrant.

Urban Footprint provides a cloud-based urban planning software built by urban planners and designers who truly understand planning needs. Service includes actionable data, scenario building, and multi-metric analysis.

The purpose of the NACTO Urban Bikeway Design Guide (part of the Cities for Cycling initiative) is to provide cities with state-of-the-practice solutions that can help create complete streets that are safe and enjoyable for bicyclists.

The Transit Street Design Guide provides design guidance for the development of transit facilities on city streets, and for the design and engineering of city streets to prioritize transit, improve transit service quality, and support other goals related to transit.

Urban population movement simulation tool for strategic planning.

Open source and free, web-based urban design platform.

Policy Guidebook for urban transportation and land use decision makers.

The Option Generator allows users to create a list of ranked policy instruments based on individual search criteria.

Open-access scenario planning package that allows users to analyze how their community's current growth pattern and future decisions impacting growth will impact a range of measures from public health, fiscal resiliency and environmental sustainability.

Citilabs offers a number of analytical and visualization products to aid in modeling population movement, scenario planning, and transit operations.

Guidelines for cities to implement sustainable and environmental mobility strategies for people and goods.

Williams Goldhagen draws from recent research in cognitive neuroscience and psychology to demonstrate how people’s experiences of the places they build are central to their well-being, their physical health, their communal and social lives, and even their very sense of themselves. From this foundation, Goldhagen presents a powerful case that societies must use this knowledge to rethink what and how they build: the world needs better-designed, healthier environments that address the complex range of human individual and social needs.

"A pioneering urban economist presents a myth-shattering look at the majesty and greatness of cities."

"This paper builds on the growing scholarship on neighbourhood-level GHG production by combining emissions calculations from embodied energy, building-operating energy, and transportation energy, examining four variations of residential density."

Currently, little planning is being done to prepare for driverless technology. Actors at multiple levels, however, have tools at their disposal to help ensure that new technology does not come at the expense of the nation’s remaining natural habitats. This Article advocates for a shift in paradigm from policies that are merely anti-car to those that are pro-density, and provides suggestions for both cities and suburban areas for how harness the positive aspects of driverless cars while trying to stem the negative. Planning for density regardless of technology will help to ensure that, for the world of the future, there is actually a world.

This report describes a shoppers trip and what the planner may be most interested in about it as well as street design and it's accommodation for all activities that may need to happen throughout the day.

"This paper explores the relationships between transportation, land use and taxation. It investigates how current land tax and regulatory practices affect the amount of land devoted to roads and parking facilities, and how this affects transport patterns. It discusses ways to measure the amount of land devoted to transport facilities, examine how this varies under different circumstances, estimate the value of this resource, evaluate how tax policies and regulations policies treat this land, and analyze whether current practices are optimal in terms of various economic and social objectives."

This paper introduces Metrolinx’s recently released Mobility Hub Guidelines and highlights two key aspects of the document: the importance of classifying the current and planned urban context and transportation function at a mobility hub, and methods to overcome challenges in achieving both transport and placemaking roles.

From ancient Rome to modern Atlanta, the shape of cities has been defined by the technologies that allow commuters to get to work in about 30 minutes.

Concerns over rising fuel prices and greenhouse-gas emissions have prompted research into the influences of built environments on travel, notably vehicle miles traveled (VMT). Accessibility to basic employment has comparatively modest effects, as do size of urbanized area, and rail-transit supplies and usage. Nevertheless, urban planning and city design should be part of any strategic effort to shrink the environmental footprint of the urban transportation sector.

This report includes information on the first of many research tasks planned for the partnership between SDOT and the Urban Freight Lab. This is the first assessment in any American city of the privately-owned and operated elements of the Final 50 Feet of goods delivery supply chains. These include private truck freight bays and loading docks, delivery policies and operations within buildings located in Center City.

"The following key findings are based on the World Population Prospects 2019: Highlights, which presents the latest round of global population estimates and projections by the United Nations."

Autonomous vehicles will have a major impact on parking facility designs in the future. Compared to regular car-parks that have only two rows of vehicles in each island, future car-parks (for autonomous vehicles) can have multiple rows of vehicles stacked behind each other. Although this multi-row layout reduces parking space, it can cause blockage if a certain vehicle is barricaded by other vehicles and cannot leave the facility. To release barricaded vehicles, the car-park operator has to relocate some of the vehicles to create a clear pathway for the blocked vehicle to exit. The extent of vehicle relocation depends on the layout design of the car-park. To find the optimal car-park layout with minimum relocations, we present a mixed-integer non-linear program that treats each island in the car-park as a queuing system. We solve the problem using Benders decomposition for an exact answer and we present a heuristic algorithm to find a reasonable upper-bound of the mathematical model. We show that autonomous vehicle car-parks can decrease the need for parking space by an average of 62% and a maximum of 87%. This revitalization of space that was previously used for parking can be socially beneficial if car-parks are converted into commercial and residential land-uses.

Using data from the recently released American Community Survey, this report examines population change in the 51 metropolitan areas with 1 million or more population, and focuses on the change in population in close-in neighborhoods, those places within 3 miles of the center of each metropolitan area’s primary central business district.

"Here we present a unique long-term (decadal) record of CO2 mole fractions from five sites across Utah’s metropolitan Salt Lake Valley. Four state-of-the-art global-scale emission inventories also have a nonlinear relationship with population density across the city; however, in contrast to our observations, they all have nearly constant emissions over time. Our results indicate that decadal scale changes in urban CO2 emissions are detectable through monitoring networks and constitute a valuable approach to evaluate emission inventories and studies of urban carbon cycles."

This report estimates that by 2030, a substantial share of the 175 million Americans who live in the nation's largest cities will turn to SAEVs, cutting transportation costs by nearly 50%, reclaiming time instead of losing hours a day to traffic and putting up with all the expense and hassle of urban automobile ownership. SAEV fleets will account for nearly 25% of all auto passenger miles traveled in the US by 2030. Such a change will have an enormous impact on health, safety, and quality of life in cities: Traffic accidents and fatalities will be reduced by nearly two-thirds. Pollution will be drastically curtailed. Cities can repurpose millions of square feet once used for parking to new green spaces or commercial uses while securing more affordable mobility and accessibility for elderly, disabled, and low-income people.

As public transit stagnates in most U.S. cities, central Seattle continued its rapid growth by adding roughly 10,000 morning transit commuters last year, new local data show.

The author presents his view of limitations of prediction and how it apply to transportation prediction such as ridership prediction. He describes the concepts for planning the future (with time and space) that always emphasize the freedom as the goal.

This paper presents an analysis of the data and frames it in a broader context. It concludes with a description of FTA actions that address climate change.

Upon the roll-out of AVs into our streets, the importance of public and private sector partnerships are emphasized. With increased mobility, the demand for private rides could be increased and therefore increase congestion in our streets.

Between April 18 and May 9, 2014, Davis, Hibbitts & Midghall, Inc. (DHM Research) conducted an online survey of respondents living in Clackamas, Multnomah, Washington and Clark counties about their current and preferred residential and neighborhood preferences. The objective of the survey was to assess general opinions and preferences around housing and neighborhood choices and factors that may influence those choices. Portland State University and Metro developed the questionnaire with input from DHM.