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Street design tool incentivizes iterative urban planning in contentious redevelopment process

Trondheim, Norway
Contact Partner


100 Thousand EUR

Project Status

In Progress/Under Construction since 2018



Challenges Addressed

Citizen Engagement
Pedestrian & Bicycle Safety
Mobility & Access


Sustainable city
Equitable city

Funding / Financing

General Fund/Existing Public Funds

Project Type


At a Glance

City engineers in Trondheim used Streetmix's open source, drag and drop streetscape visualization tool to facilitate more productive community and leadership engagement, leading to a bypass street redesign that was embraced by all stakeholders.

Problem Addressed

City traffic engineers and planners were responsible for building a new bypass on a main road that would reuse the existing footprint of the street. Locally, there were many different inputs - from political advocates for bike lanes, to community activist groups that wanted to remove cars from the street completely, and resident preferences for the design of bus shelters. To make the process more challenging, while the community was responsible for the design contributions ultimately the roadway was owned by the county who had to sign off on how the $30 million budget would be used.

The municipality needed a tool to collect feedback and get the community in agreement about how to move forward.

City of Trondheim used/is using an open-source design platform to address this/these challenge(s).

Solution(s) Used

The city planners and engineers decided to use Streetmix over a traditional AutoCAD system because it facilitated more productive discussion among the various stakeholders. Specifically, the team created 2-3 cross sections that provided different options for how the street could be designed that they presented to political leadership and at community meetings. At the town hall sessions, residents could provide specific feedback and even make changes to the design together in real time.


  1. Shortened the iterative design process with stakeholders to 6-months
  2. Shortened the iterative design process with stakeholders to 6 months
  3. Residents reported greater satisfaction in the process because they were able to engage directly around the pros and cons of various options
  4. Using Streetmix saved the city $100,000 compared to using traditional AutoCAD tools because it's specifically designed to rapidly prototype community-driven street designs.

Something Unique

Over the course of 6-months the city used the free open-source platform to create 10 different iterations of the street design to land on one that was approved.

Who Should Consider?

Any city or county hoping to integrate resident feedback into street-level planning and redevelopment.

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