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American Cities Climate Challenge

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The Bloomberg American Cities Climate Challenge is an initiative to reduce emissions in 25 of America’s largest cities.

Recognizing that cities account for more than 70% of global carbon emissions–and that mayors have significant authority over high-emitting sectors: transportation and buildings–the Climate Challenge provides support to cities working to realize their aggressive carbon reduction goals.

With transportation as the largest single sector of carbon emissions in the US, implementing projects that reduce reliance on personal vehicles is critical to addressing climate change.

NACTO’s Role

Since 2019, NACTO has supported the 25 ACCC cities by providing broader technical and policy guidance to all 25 cities participating in the challenge, targeted in-person workshop-style trainings in three cities, and in-depth “Accelerator” support in six transportation-focused cities.

In 2021, NACTO will work with a subset of cities, providing focused implementation guidance to address specific challenges to building equitable bike and transit projects and fostering a network of peer experts to address project barriers and bolster internal project champions.

NACTO support will take the form of targeted office hours,  design working sessions, convenings, and in-depth workshops to address acute challenges and institute new processes and structures for success intended to benefit the city beyond the Climate Challenge program.

NACTO Climate Challenge Fact Sheet >>

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Trainings and Charrettes


Agency Structure, San Antonio (6/9 & 6/11/2021)
Transit Metrics & Messaging, Cincinnati (5/27 & 6/3/2021)
Complete Streets Communications, St. Petersburg (5/19 & 5/26/2021)
Equitable & Inclusive Engagement, St. Louis (5/18 & 5/19/2021)

Design Trainings

Cincinnati (3/3/2020)
St. Petersburg (12/13/2019)
Honolulu (11/15/2019)

Digital Design Charrettes

Minneapolis (8/10/2020)
Charlotte (7/29/2020)
Washington, DC (3/11/2020)
Philadelphia (2/28/2020)
San José  (12/11/2019)
Saint Paul (11/1/2019)
Honolulu (8/14/2019)
San Diego (7/8/2019)

Digital Policy Charrettes

Philadelphia (8/24/2020)

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Blog Posts

Climate Challenge Accelerators: Fighting for a safer future, today (2/4/2021)
NACTO’s Design Trainings: Helping Your City Achieve its Goals (1/14/2020)
Climate Actions Keeps Rolling in San Antonio and Boston (11/15/2019)
Climate Action on the Streets of Denver, Atlanta, and Minneapolis (9/30/2019)

Cities-Only Webinars

Making the Case for Complete Streets: the Power of Images (1/28/2020)
They Didn’t Give Up at the Intersection (11/19/2019)
Limiting Opportunities for Speeding (11/7/2019)
Making it Count: Using Data for Public Outreach (8/8/2019)
It’s Crunch Time: How to Get Hard Data (7/23/2019)
Driving Decisions with Data (7/18/2019)
Swing for the Geofence (6/20/2019)

Public Webinars / Workshops

Curbing Carbon Emissions: Realizing Sustainability Goals with Progressive Curbside Management (12/4/2020)
Avoiding Gridlock: Strategies to Keep Cities Moving in a Pandemic & Beyond (9/3/2020)
Equitable Public Engagement in Transportation Budgets (8/2020)
Thinking Outside the Box: Urban Freight & Delivery During COVID-19 (6/4/2020)
Streateries: Creating Space for Physical Distance at Restaurants (5/22/2020)
Essential Movement: Building Temporary Bicycle & Pedestrian Facilities During COVID-19 (5/14/2020)
Speed Management on Silent Streets: Tools & Tactics for Reducing Speeds (5/1/2020)
Community Engagement During COVID-19 (4/23/2020)
Slow, Shared, and Safe: Closing Streets to Thru-Traffic During the Coronavirus (4/22/2020)
City Streets during Coronavirus: a Public Health Perspective (4/15/2020)

Press Releases / Public Statements

San Antonio and VIA Announce Partnership with NACTO, NRDC, and Bloomberg Philanthropies to Redesign Streets for Faster Transit and Improved Safety for People Walking and Biking (10/22/2019)
NACTO Announces Partnership with Five Cities to Rapidly Design and Build Low-Carbon Transportation Projects by 2020 (5/15/2019)


Zarzamora Street to Become Testing Ground for Transit, Safety Projects (Rivard Report, 11/3/2019)
City of San Antonio to redesign roads to make them safer, public transportation faster (KSAT, 10/31/2019)
Atlanta Is Taking Action for Safer Streets (NRDC, 10/28/2019)
Every bus in this country deserves its own lane (Curbed, 10/14/2019)
California Cities Rolling Toward a More Sustainable Future (NRDC, 5/20/2019)
Atlanta, Boston, Denver, Minneapolis, and Philadelphia are about to jump-start their bike infrastructure (Fast Company, 5/17/2019)
NACTO partners with 5 cities on low-carbon transport projects (Smart Cities Dive, 5/16/2019)

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NACTO's City Accelerator Program

The City Accelerator program helps cities rapidly implement high-quality transit or bike corridors, from design to build out. The program was started in 2014 as way to provide in-depth, on-the-ground support to member cities implementing new street design projects that may depart from existing practice.

Whether a red bus lane or protected bike lane, undertaking new projects requires changing business as usual. Under Accelerators, NACTO helps cities develop the new partnerships and pathways needed to implement these projects, bringing together the rich peer network to help cities move projects from idea to implementation through lasting programmatic change.

Transit Program Accelerators

Better Bikeways Accelerators

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Climate Action Through Street Design

Projects on the ground in Accelerator cities Atlanta, Boston, Minneapolis, and Denver.

Better bikeways and transit facilities increase reliability, improve safety, and create more options for lower-carbon travel.