Illustration of Bridge X proposal for Brooklyn Bridge developed by ScenesLab

We applied the strategies for transport experimentation in our Bridge X design for the Re-imagining Brooklyn Bridge design competition in 2020 (Source: ScenesLab,

Our paper Experimentation as a Public Engagement Strategy in the Bridge X Proposal for Reimagining Brooklyn Bridge was selected for presentation at the 2021 Transportation Research Board meeting, this year all online.

The paper presents recommended strategies for using experimentation to implement big transport changes in cities. Cities have been using tactical urbanism to implement “small” changes for many years, but only rarely have experimented with big changes. The strategies were identified by looking at examples of big changes including removal of San Francisco freeways, introduction of congestion charging in Stockholm and pedestrianization of Times Square.

Illustration from BridgeX proposal by ScenesLab

BridgeX balcony zone by ScenesLab

We applied the recommended experimentation strategies in developing the BridgeX proposal for New York’s Reimagining Brooklyn Bridge design competition in summer 2020. The big change consisted of creating open space on the existing Brooklyn-bound lanes and shifting all traffic to the existing Manhattan-bound lanes while the bridge’s promenade deck is widened to reduce pedestrian and cyclist overcrowding. New Yorkers could decide to keep the open space or return traffic to the Brooklyn-bound deck after completion of the promenade widening. The same experiment could be tested with the winning proposal Brooklyn Bridge Forest.

We’ll be online for our poster presentation in TRB 2021 – Session 1175 – Current Issues in Public Engagement and Communications; Tuesday 26 January 2021; 11:30 AM to 13:00. Here are links to our presentation slides and video. And, here’s the paper abstract:

Cities are increasingly using experimentation to test innovative and controversial policies and infrastructure projects. Experimentation consists of making temporary changes, carefully assessing their impacts, and using this assessment to decide whether to keep the changes or refine them. For example, tactical urbanism tests small changes such as cycling lanes. Using experimentation for large changes is more difficult and often depends on seizing unique opportunities. This paper outlines a model and recommendations for using experimentation in transport planning and applies them in a case study. It argues that enabling people to directly experience the impacts of a transport change provides them with a much better understanding of project impacts and benefits than possible in traditional transport planning processes. The case study describes how experimentation was integrated into Bridge X, a proposal prepared for the Reimagining Brooklyn Bridge competition. Bridge X combined one large transport experiment (replacing the bridge’s Brooklyn-bound vehicle lanes with space for active transport and open space), with many small urban design and transport experiments on multimodal access routes, the vacated bridge deck and anchorage areas. Bridge X proposed initial ideas for these transport and open space designs as well as community engagement processes. A continuing public engagement process was proposed to refine these initial ideas. This paper presents a model for using experimentation in transport planning, the case study and recommendations.