517.Where is a triangular 'Attention: Signal Ahead' warning sign most likely to be installed?
(A) Atintersections with traffic control signals, to enhance signal visibility.
(B) At an appropriate distance in frontof an intersection where signals are difficult to notice, to warn drivers in advance.
(C) At unsignalizedintersections, to replace traffic control signals in regulating traffic.No. Ans Question

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考試觀念 本題測驗的是道路警告標誌的設置...
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