this third roadway was built as a single-lane busway, the first in the united states, before being expanded and converted to hov use. a 2007 survey found that during the morning rush hour, the hov lanes carry about 65% of travelers on i-395 (61,000 commuters), including 32,000 in transit buses and 29,000 in private vehicles with two or more people. the other 33,000 commuters (35% of total users) drove alone.