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For more on marking an answer as the "Best Answer", please visit our FAQ.1.) On a double-decker, lateral movements are exaggerated (magnified) due to the combination of its height and suspension. The forces generated by the bus turning a corner that, (if standing on the lower deck), would have you grabbing for the hand-rail, are enough to throw you off you feet on the top deck. Thus, in the interests of 'customer' safety, (and to limit the company's liability), standing on the top deck is discouraged. (How you actually get on and off the upper deck without standing beats me - but then I wouldn't try and sue them if I smacked my chin on a seat-back because I was standing whilst the bus was moving.)
2.) It is discouraged because it may crowd the aisles and stairways.
3.) An excess of 'standees' (yes, that's the term for them these days - check the 'capacity' signs near the driver next time you're on a bus) on the top deck of a double-decker would shift the centre of gravity upwards, making it top-heavy and dangerously unstable.