| 摘要 |
PURPOSE:To display many control information in a short distance by arranging plural marks in a direction of line lateral width and making to length of each mark different from each other. CONSTITUTION:A control mark (m) to indicate various running control information to a moving truck is formed such that a resin mixed with a magnetic substance similarly to the case with a inductive guide line L is formed to be a thin strip, and a magnet chip (mt) whose length differs in plural ways is used and the content of information to be indicated is represented by combining the presence of the magnet chip (mt) at the setting position, the magnetic pole formed on the surface and the length of the magnet chip (mt). Moreover, a trigger magnet chip mT representing the mark read start position with a small area and formed shorter than the marks m1, m2 of plural numbers is provided. Thus, many control information are displayed while the length of the control mark is kept not so long.
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