Traffic flow indicator for roadway placement

作者: Gerald R. McDonald

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摘要: A marker of thick elastomeric sheet material for temporary rested placement on a road surface to indicate detour lane about construction site or the like. The is arrow shape. Openings in provide handgrips convenient handling during setting out and retrieval same. modified segmented variable length may be placed surface. further includes separate head main body portions which include coupling arrangement joining field.

参考文章(3)
Floyd L Adams, Traffic directing marker ,(1965)
Schnee Robert Francis, Plastic floor coverings ,(1949)
Robert R Robertson, Traffic lane divider ,(1936)