单项选择题

A．Highway crime.
B．Drivers" errors.
C．Poor traffic control.
D．Confusing road signs.
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单项选择题
A．Improved highway design.B．Better public transportation.C．Regular driver training.D．Stricter traffic regulations.
A．Improved highway design.
B．Better public transportation.
C．Regular driver training.
D．Stricter traffic regulations.
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