When looking for an image of a typical bus used by Greyhound and others in the US I could find nothing suitable. This is the result of my work in rendering the vehicle so popular in the late 1960's and 1970's.
1960年的通用PD-4106總線
bus、gm、pd4106、public、transit、vehicle
總線、克、pd4106、上市、過境、車輛
資料來源：openclipart ( https://openclipart.org/ )