I drive into D.C. everyday for work and those damn nickel chasing cabbies drive like they:
a) don't have a clue that there is other traffic on the road
b) will make a turn right in front of you without thinking, forcing you to get on the brakes and horn.
This is where the horn part comes in. We all know that the stock Jeep horn leaves a bit to be desired as an attention getter. I got tired of this, so I went and got a set of FIAMM, Triple Trumpet Riviera horns. They put out a simple 115db's, not the loudest horns around but enough that it should get thier attention.
Just put them in and they are LOUD
Guess I'll try them out when I go to work tonight, since I'm sure there will be at least one idiot on the road.