Quite a scene as a truck caravan reached L.A. City Hall this morning - but not before snarling traffic on the Long Beach Freeway. The truckers are protesting the Clean Truck Program that's been instituted at the ports of Los Angeles and Long Beach - and which they say has eaten into their income. (I always wonder what the organizers of these protests expect to accomplish, other than angering many thousands of commuters who have nothing to do with their gripes.) After stating their piece at City Hall, it's apparently back onto the 710, so drivers beware. (LAT)