Traffic on San Diego County's lone tollway — the South Bay Expressway — hit the skids this summer, largely because of a sour economy that has undercut one of the road's major selling points. When it opened two years ago, the tollway was pitched as a hassle-free alternative to busy Interstate 805 and other roads. But a regionwide drop in congestion appears to be making it less of a magnet for harried commuters. Join discussion...