ANSWER · B
Diversion control on the expressway means controlling subsequent traffic at the ramp when an emergency occurs, to prevent further accidents and congestion. The road may also be closed in advance because emergency traffic guards are present, so vehicles are diverted in advance.
Pass China's driving test.
All 3,068 questions, mock exams, wrong-answer reviews and bookmarks in the app. One-time $7.99.
Download on the App Store