If you enjoy sitting in your car until your butt melds with the seat, or grinding your teeth into a fine powder, then by all means, travel southbound on the Palmetto during rush hour, or at any hour for that matter. Once you pass the NW 25th Street exit, settle in and pull out that book you've been trying to finish, because you won't move soon. The Dolphin Expressway interchange is up ahead, and these are the two most congested expressways in the Western World. It is a guaranteed fact that you will get flipped off at least once, probably by some jerk on a cell phone who has just cut you off. Traffic is so bad here that the Miami-Dade Expressway Authority and the Florida Department of Transportation are planning to begin redesign and reconstruction of the entire interchange late this year. That will deepen this traffic quagmire for six years. That's right, six years. The construction warning signs should say, "Abandon all hope ye who enter here."