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. The ability to get additional sleep on the way to work is attractive to many business commuters using public transport. Because night trains or coaches can be cheaper than motels, homeless persons often use these as overnight shelters. Most transportation agencies actively discourage this. For this and other reasons passengers are often required to exit the vehicle at the end of the line. After this, they can board again in the same or another vehicle, after some waiting. Also, even a low fare often deters the poorest individuals, including homeless people, which many wealthier commuters for reasons of their own are uncomfortable around.
 
Some systems prohibit passengers from engaging in conversation with the operator. Others require that passengers who engage in any conversation must keep the noise level low enough that it not be audible to other passengers.
 
Some systems have regulations against photography or videography of the system's vehicles, stations, or any other property. Those seen holding a mobile phone in a manner that appears to be used for photographical purposes are considered to be suspicious for breaking this rule. Many systems have regulations against behavior deemed to be unruly or otherwise disturbing to other passengers. In these cases, it is usually at the discretion of the operator, transit worker, or police officers to determine what behaviors fit the description. Some systems have regulations on the use of profanity.

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