Originally Posted by Garland

Firstly...muay thai was derived from krabbi krabong, which was an OFFENSIVE based art. These precursors to modern muay thai were not meant for the ring or the "street", but devised for killing and maiming in battle. (rent Sukiyothai)

Secondly - what the **** would you consider to be a "street martial art"?
The most common "street" moves are...sucker punches and foul tactics, plus a few lame ass punches (i.e. the haymaker).
ANY art, applied by a competent enough person, with the proper physical attributes, can "work" on "the street".
But;
boxing...cannot be beat for hands. Muay thai cannot be beat in the standup game. (except by the most exceptional kyokushin guys) BJJ and Shooto are excellent for the ground game. The FMA are the only weapons systems that won't teach you shit that can get you killed. Wing chun is supherb for the trapping range....which does not last long in a real fight.

Muay thai-will help you in the street. There are tactics in muay thai that are meant for causing maximum damage, and are not meant for use in a ring fight.
Some tactics are; elbows to the collar bone, stomps to the patella, headbutts, eye gouges in the prummb, and knees to the nuts. Muay thai also has a few "hidden" chokes in the clinche, and a few breaks and throws from there also.