Dive Brief: The Pennsylvania Department of Transportation (PennDOT) has announced the completion of the state's first-ever diverging diamond interchange (DDI), located on Interstate 70, according to Equipment World. The DDI design eliminates left turns across oncoming traffic, improving vehicle flow and decreasing the chance of accidents. The agency also chose the DDI configuration because it could use the former interchange's cloverleaf footprint, reducing the impact of construction on the area. PennDOT said it modified the traditional DDI design slightly. Dive Insight: Design is one way transportation agencies are combating gridlock resulting from increased traffic. Other tools in DOT arsenals are...