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Reference.org
Advanced stop line
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<p>An advanced stop line (ASL), also called advanced stop box or bike box, is a type of road marking at signalised <a href="/facts/Road_junction/Q1AJe9o4">road junctions</a> allowing certain types of vehicle a <a href="/facts/Head_start_(positioning)/YPzMC6qC">head start</a> when the <a href="/facts/Traffic_signal/v5pwcfsQ">traffic signal</a> changes from red to green. Advanced stop lines are implemented widely in Denmark, the United Kingdom, and other European countries. </p>