Idiom:

pride goes before a fall ( arrogance causes failure )

Hit the book:

Escalator

Virtually

Trap

At ease

In case

Handrail

Trip

Stay put

stroller

There are numerous escalators all over the nation and virtually all people use these machines. It is even believed by some that riding escalators are much safer than riding elevators. Actually, it is not. As accidents happen in elevators, so do in escalators. They may be rare but still, it happens.