yep. calling this "art" is a stretch.
the significance of this throw-up is
elevated by the "daring stunt" and "its amazing feat". Its good work by itself, but given the location, degree of difficulty, and exposure/visability - it becomes great.
The tag is SWS/DTS.
http://en.wikipedia.org/wiki/Graffiti_terminology tag (scribble)
A stylized signature, normally done in one color. The simplest and most prevalent type of graffiti, a tag is often done in a color that contrasts sharply with its background. Tag can also be used as a verb meaning "to sign". Writers often tag on or beside their pieces, following the practice of traditional artists who sign their artwork.
"Tagging" is often the example given when opponents of graffiti refer to vandalism, as they use it to label all acts of graffiti writing (it is by far the most common form of graffiti).
throw-up
A throw-up or "throwie" (also known as a fill-in) sits between a tag and a piece in terms of complexity and time investment. It generally consists of a one-color outline and one layer of fill-color. Easy-to-paint bubble shapes often form the letters. A throw-up is designed for quick execution, to avoid attracting attention to the writer.
blockbuster or roller
A large piece done simply to cover a large area solidly with two contrasting colours, sometimes with the whole purpose of blocking or covering other "writers" on the same wall.
piece (short form of masterpiece)
A large and labor-intensive graffiti painting. Pieces often incorporate 3-D effects, arrows, and many colors and color-transitions, as well as various other effects. Considered the full and most beautiful work of graffiti. A piece requires more time to paint than a throw-up.