transportational.org
The campaigning side of this sector is enormous and fragmented. Cycling organisations, pedestrian safety groups, rail user associations, bus advocacy, road danger reduction, transit funding coalitions. Thousands of bodies, almost all nonprofits, almost all on this extension.
What most of them lack is an identity that spans modes. Naming yourself for buses or bicycles wins you a constituency and loses you the argument that the whole system needs planning together.
An adjective solves that. Transportational qualifies anything without committing to a mode, which suits a coalition, a research institute, a policy programme or an umbrella body covering several campaigns.
The word is real, unused commercially, and spelled the only way it can be, so the trademark path and the search results are both clear.
Sixteen letters, no hyphen, on the extension the sector already occupies.
The name is available. Enquiries welcome.