May 30, 2017 - DGL is pleased to announce that Corrinne Lochtefeld has passed her professional engineer exam! Join us in congratulating Corrinne on this impressive career achievement. Corrinne joined DGL in May 2013, as part of our traffic and safety group as a traffic engineer, working on both roadway and traffic projects. Her ability to work on projects through all facets makes her a valuable member of the DGL team. Traffic related specialties include manual and hose counting, traffic impact studies, arterial analysis and roundabout analysis.