Public Bus:
公交车
Gōng jiāo chē

公共汽车
gōng gòng qì chē

Examples:

You could use a bike, walk, or take a bus to get to the office.
从这到公司，可以骑自行车、走路或者乘公交车。
Cóng zhè dào gōngsī, kěyǐ qí zìxíngchē, zǒulù huòzhě chéng gōngjiāo chē.

My sister always ride the bus to work.
我的姐姐总是乘公交车上班。
Wǒ de jiejie zǒng shì chéng gōngjiāo chē shàngbān.

Bus stop
公共汽车站
Gōnggòng qìchē zhàn

Following is a video about a group singing on the public bus.