I didn't know it was even possible to enter LSD at 55th and 43rd ...
Besides that, why are they insisting that you enter at 47th rather than 57th (which is what I suppose you mean)? I guess they would rather sit through traffic and extra stoplights on Lake Park to save 50 cents.
Maybe they should take the #6 bus if they insist on you taking the slower route rather than you doing them a favor by taking the FASTER route!