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.
单项选择题
A．The causes are familiar.B．The causes are not well understood.C．The causes are obvious.D．The causes are very complicated.
A．The causes are familiar.
B．The causes are not well understood.
C．The causes are obvious.
D．The causes are very complicated.
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