单选题ARegular driver training.BImproved highway design.CStricter traffic regulations.DBetter public transportation.
单选题
A
Regular driver training.
B
Improved highway design.
C
Stricter traffic regulations.
D
Better public transportation.
参考解析
解析：
细节题。录音提到“Improved design has helped to make highways much safer”，可见“Improved design”是比较成功的措施。故选B。
细节题。录音提到“Improved design has helped to make highways much safer”，可见“Improved design”是比较成功的措施。故选B。
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