| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a track board, changing a running environment in the middle of a race. Ž<P>SOLUTION: This track board includes: an obstacle capable of moving forward and backward to a running path to thereby obstruct passing of a toy vehicle; a motor for moving forward and backward the obstacle to the running path to change the forward and backward movement position of the obstacle; a motor driving circuit for operating the motor; a step tread constituting part of the road surface and pressed below by the weight of the toy vehicle when the toy vehicle passes; and a first switch provided in the motor driving circuit to be put in the off state in the normal state and be turned on while the step tread is pressed down to operate the motor driving circuit. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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