English: longer distance bus service
Welsh: gwasanaeth bysiau pellter hir
Subject: Trafnidiaeth
Welsh definition: A service for the carriage of passengers by road at separate fares, longer than 15 miles as measured in a straight line.
Notes: Cymharer â'r diffiniadau ar gyfer gwasanaeth bysiau lleol, gwasanaeth bysiau cyflym, a gwasanaeth coetsys cyflym.