sentences:  Prior to its closure for rebuilding in 2007, the Portland Mall's design permitted private vehicle traffic to use the left lane, but only in short, two-block segments.In every third block, the lefthand (auto) lane disappeared for one block, and the otherwise three-lane-wide street became two lanes wide and restricted to buses only.In this way, two-thirds of the specific blocks along 5th Avenue and 6th Avenue remained open to cars, but use of those streets for "through" travel by cars was prohibited.