Although 'farther' and 'further' are becoming interchangeable, 'farther' is still preferred for physical distance. Your sentence itself makes little sense-- farther than what ?
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Yesterday I saw a cat going off the road, which was further away from me.While walking on the road, the cat saw a car heading towards it, so it suddenly went off the road which was a little distance away from me. I was walking on the pavement.