Diverging Diamond Interchange
Letter: It’s no wonder accidents are down on I-77 overpass
March 10. [Opinion] There is no surprise that accidents are down after the Catawba overpass was “inverted.” The DDI design is known to slow traffic speed and improve safety. However, the often-stated claim that it improves all traffic flow is not supported by studies or experience. The DDI design prioritizes highway access over local through-traffic. […]
It may not be popular, but the DDI is safer
By Dave Vieser. There has been a 58 percent reduction in accidents at the Exit 28 interchange in Cornelius since the Diverging Diamond Interchange (DDI) opened in 2014. Our stats tend to mirror those from other parts of the country where the innovative interchange has been implemented. Cornelius was the first in the state. It’s […]
