HEI was selected by the LaSalle County Highway Department to provide preliminary engineering services for the Highway Safety Improvement Program (HSIP) project at the intersection of CH 15 and CH 4 north of Marseilles. The CH 15 and CH 4 intersection project is a two-way stop-controlled intersection which has been the sight of multiple fatal crashes. HEI assisted LaSalle County in preparing a successful HSIP application by performing a traffic study and crash analysis. Once HSIP funding was granted HEI performed Phase I and Phase II engineering services. The scope of work included investigation and preliminary design of a rural roundabout. Due to funding restrictions a lower cost option was also investigated and ultimately chosen. The chosen option included radius widening, intersection lighting, raised medians on the stop-controlled legs and installation of flashing “Stop” and “Cross Traffic Does Not Stop” signs.