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> エスカレーターの **上** を歩くと、ほかの人にぶつかって落ちる危険があるため、やめてほしい。  
>  Because there's a risk of bumping in to other people and falling when you
> walk _along the top_ of the escalator, we want people to stop doing it.

I'm a bit confused about the use of 上 in this sentence. Can't I just say
エスカレーターを歩く? After all, there's no other part of an escalator you can walk on.

I see the same in thing in: 氷の上を歩く
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2017-07-22T19:13:12.310
51625
2017-07-22T20:02:49.313
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question
reading-comprehension
Is の上 required in エスカレーターの上を歩く
> I'm a bit confused about the use of 上 in this sentence.  
>  Can't I just say エスカレーターを歩く? After all, there's no other part of an
> escalator you can walk on.

I agree with you. In this case, it's not necessary, but nonetheless as a
Japanese expression, it's not very unusual.

> I see the same in thing in: 氷の上を歩く

氷を歩く becomes unclear and poetic. We don't normally say 土を歩く, but we say
土の上を歩く, 草の上を歩く, though 砂浜を歩く, 歩道を歩く.

I see that we differentiate 'where' and 'on what'; 氷, 土 and 草 are quality or
material.
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2017-07-22T19:48:53.307
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2017-07-22T20:02:49.313
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answer