Dec. 28, 2002, 10:19AM Fog causes at least 50-vehicle pileup on tollwayAssociated PressAt least 50 cars were involved in a traffic pileup this morning as thick fog reduced visibility on the Sam Houston Tollway. Broadcast reports said about 22 people had been injured, but there were no reports of fatalities. The pileup happened about 7:30 a.m. and traffic was stalled in both directions of the tollway in southwest Harris County.