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> Boarding times though?

Often true. OTOH, the reduced footprint (vs. either 1 articulated or 2 normal busses) can speeds things up, especially on cramped and congested city streets. And if you're getting near gridlock-level congestion, the length of the articulated busses can be like dumping gravel into your system's gearbox.

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These issues are solved with dedicated bus lanes, which are desirable even for double deckers.
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True. While I love our articulated buses in Kraków, if one of these stops mid-turn on an intersection, it blocks 3 out of 4 movement directions.
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> Boarding times though?

cant they just put another entry door?

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You can, but it's easier to evade fares. The driver can enforce fares better at the door near them.

My local transit agency just stopped allowing rear door boarding, and that was one of the main reasons: https://waypointblog.com/capmetro-is-ending-rear-door-boardi...

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The goal of public transportation is to move people fast around the city. Not to have the driver sell the tickets, that’s what the ticket machine is for (both on stations and on board). Anybody using public transportation daily probably has a monthly ticket anyway. And not to provide tourist information.

People want to get to work on time after all. Entering and leaving the tram or bus through all door is a simple way to improve public transports reliability.

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maybe i dont understand how articulated bus makes boarding faster. If anything it makes it slower compared to double decker .
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Double deckers I’ve seen have just one narrow staircase. You can’t have people go up and down at the same time. Through a door you can move some people in and out at the same time, however it’s rude, but since it’s a door and not a lengthy corridor, you can easily have a group of people go out, let new passengers in, and get in again.
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The original designs had boarding at the back. Don't even have to stop people can just leap on.
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