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Single drivers are taking over Mass. carpool lanes

Traffic on I-93 South coming out of Boston in February. –Jessica Rinaldi/Globe Staff/File

The high-occupancy vehicle lanes, or carpool lanes, north and south of Boston are not really what they’re cracked up to be.

The HOV lanes, which are intended to give vehicles with at least two occupants a more efficient travel lane, are overwhelmingly used by cars with only a driver, Transportation Secretary Stephanie Pollack said Tuesday.

’’I was shocked to find out that there is a closed Twitter group for people who use your carpool lane where they tweet at each other and say, ‘there’s no cops, it’s OK for single cars to use it,’’’ Pollack told municipal officials at a Local Government Advisory Commission meeting. “And we think as much as 80 or 90 percent of the traffic is actually just individual people in cars and it’s not functioning as a carpool lane.’’