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In ancient China, while walking with someone with higher status or from an older generation, one should lower head, bend down, and walk a little bit behind them.

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If three people walk together, the superior or elder one should be in the middle, which is considered honorable and safer.

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One should bow down and walk fast using smaller steps when passing by an elder or a superior.

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Except for the emperor, other people wouldn't walk in the middle of roads or stand in the middle of a door; they were supposed to walk or stand on one side. 

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When walking in residential areas, it is not polite to keep looking around. 

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Nowadays, these requirements are not strictly applied unless on important or official occasions.