Other Types of Billboards
Other types of billboards include the billboard bicycle, which is a billboard attached to the back of a bicycle or the largest mobile billboard, a special advertising trailer to hoist big banners. Mechanical billboards are billboards that display three different billboards at different times, because the three advertisements are attached to a conveyor that rolls around inside the billboard. There is also such thing as a three-dimensional billboard, such as the ones at Piccadilly Circus, London, although this type of billboard is arguably mistaken for a simple advertising sign.
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