<P> In many countries such as Australia or American states such as California, traffic barrels are rarely seen . Devices called bollards are used instead of cones where larger and sturdier warning or delineation devices are needed . Typically, bollards are 1,150 mm (45 in) high fluorescent orange posts with reflective sleeve and heavyweight rubber bases . Larger devices such as barrier boards may be used instead of cones where larger areas need to be excluded or for longer periods . In Canada they are often referred to as pylons . </P> <P> Cones are used to lay out courses for autocross competitions . </P> <P> Cones are also frequently used in indoor public spaces to mark off areas which are closed to pedestrians, such as a restroom being out of order, or to denote a dangerous condition, such as a slippery floor . They can be used on school playgrounds to limit areas of a playing field, and on ice rinks to define class, private party, or private lesson areas . Some of the cones used for this purpose are miniature, as small as 5 cm (2.0 in) tall, and some are disposable full - size cones made of biodegradable paper . </P> <P> Being distinctive, easily portable and usually left unguarded, traffic cones are often stolen . Students are frequently blamed, to the extent that the British National Union of Students has attempted to play down this "outdated stereotype". </P>

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