 These problems were a major motivation for the development of low-floor trams, which allow transit operators to avoid the retrofitting of high platforms on existing routes, while still providing improved accessibility.Although low-floor vehicles began to be developed in the 1920s, the first low-floor tram is generally recognized as the Duewag/ACM Vevey design of 1984 deployed in Geneva, providing a floor height of ATOR.Tourist coaches generally have very high floors, sometimes greater than above the road surface, in order to have ample room for luggage under the floor.