I don't know when that tren started, but it is common place now in Texas and aggravating as can be. The most irritating stretch of road in Texas is heading East from San Antonio on I-10 for that very reason. THere, it is a little more understandable because of the 5-foot entrance ramps to I-10 along there, but it is difficult to make that drive without reaching for a weapon. If I could strap some full_auto paint ball mini-guns to the roof, I would... but those would only be for ranging the target.
I want to start a point system for driving. After, say, three points in a month, you can't get on highways for six weeks. Allow each driver to "tag" three cars in a month, so people would use them wisely. A total peer-based driving system. Drive like a jack-wad, three people "tag" your plate number, and no highway for you for six weeks... Anybody in?