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.
Often there is no specific inventor of words, or phrases, but some words are made by groups of people who agree on something and need a new word to express their feelings. Here is the etymology of the word groovy, from the Online Etymology Dictionary; unfortunately it doesn't say WHO started it: groove c.1400, from O.N. grod pit, or M.Du. groeve furrow, ditch, from P.Gmc. *grobo (cf. O.N. grof brook, river bed, O.H.G. gruoba ditch, Goth.