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.
Slang is the use of words that are not considered standard English. It should never be used in academic or professional writing. Often, these words are developed from fads or simple laziness. Sometimes slang is used by a given group and those outside the group do not understand it. Slang can also be insulting to some people or groups. Some slang is associated with certain time periods. In the 1960s, young people used terms like groovy, cool, dude, far-out, and trippin'! Some of those terms are still used.