transportational.net
Every serious question in this field reduces to a graph. Stops and links, depots and lanes, chargers and routes. The domain is a network before it is anything else, and the products that matter are the ones that model it well.
Routing engines, scheduling systems, fleet telematics, demand modelling and open transit data all sit on that observation, and the sector generates far more data than it currently makes use of.
The adjective form keeps the identity broad enough to cover several of those at once, which suits a platform company or a data business with more than one product.
The word itself is real, spelled the only way it can be, and effectively unused commercially, so trademark is clean and search results are empty.
Sixteen letters, no hyphen, and it pairs with the .org for anyone wanting both.
The name is available. Enquiries welcome.