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.
The earliest known use of the word, according to the Oxford English Dictionary, was as part of a placename of a London street, Gropecunt Lane, c. 1230. Use of the word as a term of abuse is relatively recent, dating from the late nineteenth century. The word appears to have not been strongly taboo in the Middle Ages, but became taboo towards the end of the eighteenth century, and was then not generally admissible in print until the latter part of the twentieth century.