hail and ride; free boarding and alighting
Refers to a bus system where passengers can get on or off at any point along the route, not just at designated stops. Often used in rural or low-density areas.
This route has introduced a hail-and-ride system.
On a hail-and-ride bus, you can get off even between stops.
Compound of フリー (free, from English) + 乗降 (boarding and alighting) + 制 (system). A modern term for a flexible bus boarding system.