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.
It's official! Urban Dictionary is a (semi-)reliable source, even used in courtrooms to define slang. Check your word-nerd snobbery at the door and memorize these 100 words from Urban Dictionary that have changed the world. Warning: some strong language ahead (NSFW). Urban Dictionary is a crowdsourced resource to learn the meaning of slang words.