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 of the 1920's The twenties were the first decade to emphasize youth culture over the older generations, and the flapper sub-culture had a tremendous influence on main stream America; many new words and phrases were coined by these liberated women. Many of these are still used today!