This WRI paper, written by Dr. Benoit Lefevre and David Leipziger, highlights the existing funds and opportunities, to provide a clear understanding on how to have access to these climate finance flows, and to catalogue what is needed in terms of performance tracking. It presents the major climate financing mechanisms and institutions that fund transport, noting their orientation towards transport investments and an overview of how to gain access to funding. It also discusses the preconditions for accessing and receiving climate finance in the transport sector and the major challenges involved in this process. Finally, it describes the challenges and best practices of measurement, reporting, and verification (MRV) of emissions impacts from policy action.