The minimum and usual mainlane width is 12 ft [3.6 m]. The number of lanes required to accommodate the anticipated traffic in the design year is determined by the level of service evaluation as discussed in the Highway Capacity Manual.
Adj. groovy is 1853 in lit. sense of of a groove; 1937 in slang sense of excellent, from jazz slang phrase in the groove (1932) performing well (without grandstanding).. As teen slang for wonderful, it dates from 1944; popularized 1960s, out of currency by 1980.
You certainly didn't want to be known as a lollygagger at the beginning of the 20th century. Back then, lollygag was slang for fooling around (sexually, that is). That sense of lollygag was in use as long ago as 1868, and it probably originated as an alteration of the older (and more dawdlingly innocent) lallygag.