Williamsburg residents who only faced heavy traffic or a sweaty, uncomfortable subway ride on their way home today should consider themselves lucky. On Wednesday, a sinkhole about 6 feet long, 4 feet wide, and 6 feet deep opened up in the middle of Driggs Avenue, just off Metropolitan Avenue. The Department of Environmental Protection said it was caused by a break in the sewer line, and emergency crews were dispatched to replace the line. Luckily, there were no injuries, and the hole missed several cars parked nearby. The Earth really outdid itself with that sinkhole at the National Corvette Museum. Now any sinkhole that swallows less than eight classic cars feels relatively small.