Question

we can invent a robotic wheel chair which will be fixed on zebra crossing of the road side. it will be automatic that when red light will glow the person sitting on that chair will able to cross the road by sitting on that chair..the chair will be automatic so any physically challeneged person can use them, without depending on other persons to help them to cross the road.we can install this robotic wheel chair on the every crossroads (is a place where two roads meet and cross.) so every physically challenged person can use that.it will be very low cost model to help them.
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Answer 1

you have already wrote it yar . its content is more than enough for a paragraph. still if you want you can add othrr points like wht is the need of this ? as people on vehicle does not follow trafic rules and zebra crossing. etc.