  The COVID-19 pandemic has resulted in significant social and economic impacts
throughout the world. In addition to the health consequences, the impacts on
traffic behaviors have also been sudden and dramatic. We have analyzed how the
road traffic safety of New York City, Los Angeles, and Boston in the U.S. have
been impacted by the pandemic and corresponding local government orders and
restrictions. To be specific, we have studied the accident hotspots'
distributions before and after the outbreak of the pandemic and found that
traffic accidents have shifted in both location and time compared to previous
years. In addition, we have studied the road network characteristics in those
hotspot regions with the hope to understand the underlying cause of the hotspot
shifts.
