(chiefly UK) A road or other path that is kept free of obstructions, or on which stopping is strictly regulated, in order to maintain free flow of movement.
2007, UK Department for Transport, Know Your Traffic Signs, %22clearways%22+-intitle:%22clearway%22+-inauthor:%22%22&hl=en&sa=X&ei=rtsoT4ODBIbMrQe3h_CyAQ&redir_esc=y#v=onepage&q=%22clearway%22|%22clearways%22%20-intitle%3A%22clearway%22%20-inauthor%3A%22%22&f=false page 55,The red cross means no stopping, not even to pick up or set down passengers. The sign is used to indicate a 24-hour clearway (usually on a rural road) or may be incorporated into other signs with the words “No stopping†(e.g. the “no stopping except local buses†sign at bus stops. On a 24-hour clearway, the prohibition of stopping applies only to the main carriageway. You may stop in a lay-by unless there are signs to say otherwise. A 24-hour clearway does not have any special road markings, but there should be smaller repeater signs at approximately one mile intervals.
(aviation) An area projecting from the end of a runway that is kept clear of obstructions exceeding a height that increases with distance from the end of the runway.
