South Carolina transportation officials have asked for money from the federal government to study whether the first-ever car pool lanes in the state should be built on Interstate 26 in Charleston. State Transportation Secretary Buck Limehouse told The Post and Courier of Charleston that the idea of adding high-occupancy-vehicle lanes began as the area geared up for a project to widen part of I-26 to eight lanes. HOV lanes are dedicated to vehicles with at least two people in them. Limehouse says the study will cost about $4 million, and HOV lanes could be scrapped if the report says they won't work. But if they are a good idea, Limehouse says HOV lanes could come to Columbia and Greenville too. ...