Forlongdistancepublictransportofpassengers,thetrafficisnowdividedbetweenairplaneandbus.[40]itispossibletotravelrightacrosstheUnitedStatesbybus,andtheGreyhoundBusCompanyeven[41]alloverthenationforathreemonths'period[42]ofahundreddollarsorso.Bustravelischeap,and[43]toallowbusestotravelfast,thetimespentonbusjourneysis[44].Withtheirtip-backseatsandtoilets[45],theair-conditionedbusesarebuiltto[46]astolerableaspossible.[47]hasmadegreatprogress,and[48]andmuchprivatetravelitseems[49].