When a variation amount of a driving operation falls outside of a determining reference, a determining system determines that an awakening degree of a driver is decreased. The determining system changes the determining reference by whether or not a preceding vehicle is existing within a given distance. Therefore, in consideration of peripheral traffic environments such as existence and absence of the preceding vehicle, the awakening degree of the driver is determined, so that determining accuracy of the awakening degree is enhanced more than that of a conventional method.

 
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> Work vehicle door interlock with override position

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