The illustration of optional zone and dilemma zone is given: when a driver's distance from stop line is longer than the minimum distance that is required for a driver to stop, he is at optional zone.
举例分析了当驾驶员离停车线的距离大于其停车所需最小距离时，他处于可选择区域，反之，则处于困境区域。
The illustration of optional zone and dilemma zone is given: when a driver's distance from stop line is longer than the minimum distance that is required for a driver to stop, he is at optional zone.
举例分析了当驾驶员离停车线的距离大于其停车所需最小距离时，他处于可选择区域，反之，则处于困境区域。
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