Crossing the street? Its un-possible!
See to get to the far side of the street, you have to cross half the way there, yes?
Then you have to cross halfway from the middle of the street to the far side, yes?
And then halfway from that point, etc.
So in essence you will be walking 1/2 x 1/2 x 1/2x .... x 1/2 or 1/(2^X). Since this value never actually reaches 0 as x->infintiy, you will get close to - but never actually reach - the far side of the street.
(A little math humour there)