Illinois Route 78 is a state highway located in the central part of Illinois. It runs approximately 30 miles, connecting the towns of Chadwick and Mount Carroll. The route primarily serves local traffic and provides access to various rural areas and communities along its path. The highway is known for its scenic views of the surrounding countryside, featuring farmland and small woodlands. Illinois Route 78 intersects with several other roads, making it an important route for residents and visitors traveling through this region of Illinois.