Arnold Ventures’s Transportation Research and Policy is a program seeks proposals evaluating the effectiveness and/or benefits of existing transportation or transportation-adjacent policies on outcomes for communities in the United States. This program is primarily focused on traditional surface transportation — road and public transit — but is open to proposals in aviation, maritime, passenger and freight rail, trucking, and more. OFR Contact: Catherine Cotter. Amount: up to $200,000. Deadline: 3/27/26 (LOI).