BUS STOP (n.) Stagecoach halt used to summon a coach-and-four, traveller should caution against use of request halt as rider doth ignore passengers.
Dr. Johnson’s London Dictionary for publick consumption in the twenty-first century avail yourself on Twitter @JohnsonsLondon
CabbieBlog 
The request stops in Hampstead Road were okay for buses actually stopping when they saw you with your hand out. If they carried on past you, it was usually because the bus was already full.
Cheers, Pete.
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You must possess a kindly face for them to always stop.
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