InShanghai,there'remainlyfourmeansoftransportation,theunderground,taxis,busesandelectricbikes.Theundergroundismuchfasterthantaxisandbuses.Busesarethecheapestbuttheslowestofthefour.Taxisrunmorequicklythanbuses,buttheyaremoreexpensive.Now,moreandmorepeoplechoosetouseelectricbikes.Theelectricbikeisbothcleanandmobile.Italsosavesmoney.Itisthemostconvenientmeansoftransportation.