General Question

Ltryptophan's avatar

Why are buses shaped like rectangular prisms, but not smaller vehicles?

Asked by Ltryptophan (12091points) February 5th, 2023 from iPhone

If anything shouldn’t they be cigar shaped, like an airplane sans wings?

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11 Answers

filmfann's avatar

Would you consider coffins?

Jeruba's avatar

Prisms? I don’t get it. Aren’t they shaped like rectangular solids with rounded corners?

Ltryptophan's avatar

I thought that was the right way to say a rectangular 3D shape.

Jeruba's avatar

Well, this is the usual understanding of prism:

But here is another definition, one I never encountered before, in geometry or anywhere else:

So I apologize for interrupting your thread. Always good to learn something, though.

ragingloli's avatar

Because they do not need to be. For planes, being aerodynamic is important, because drag quadruples at double the speed, and planes go fast. Buses are relatively slow, so drag is not really an issue for them.
Besides, giving buses a circular cross section will make them unnecessarily bigger, since all those arc sections at the sides, top and bottom, are wasted space.

kritiper's avatar

Because to get to your seat, you have to be standing up. And the square-ish shape (from the front and rear) fits better with the width of traffic lanes.

Forever_Free's avatar

Same shape as a commuter rail car. Seats, people, luggage space, rowdy passengers.
Not to be morbid, but it helps it stop rolling. A cigar shaped or Oscar Meyer Weiner shape would just keep rolling.

RocketGuy's avatar

Planes designed to fly at high altitudes are pressurized so that the people inside will have enough oxygen pressure to survive. Pressurized containers are best to be cylindrical. Buses are never pressurized, so cylindrical shape is not necessary. In fact, rectangular (prismatic) shape for a bus is best, to allow good accessibility and generous storage space.

Call_Me_Jay's avatar

Aerodynamics are not important at the slow speeds of buses.

Jeruba's avatar

I agree with @kritiper: it’s simply the case that you have to be able to stand up and walk inside a bus. It’s a little room on wheels. Not so with passenger cars: you have to sit down to get in.

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