The adv before has 2 senses (first 1 from tagged texts)
1. (68) earlier, before -- (earlier in time; previously; "I had known her before"; "as I said before"; "he called me the day before but your call had come even earlier"; "her parents had died four years earlier"; "I mentioned that problem earlier")
2. ahead, in front, before -- (at or in the front; "I see the lights of a town ahead"; "the road ahead is foggy"; "staring straight ahead"; "we couldn't see over the heads of the people in front"; "with the cross of Jesus marching on before")