The new highway was constructed with provisions for later being expanded to a divided highway. The widening of the road to a divided highway was completed in 1940. Construction on upgrading US-61 to a divided highway is underway between Burlington and Mediapolis. It was part of an upgrade that changed Route 291 into a four-lane divided highway. The road continues as a divided highway through Revere. Caguas is served by one freeway, one tolled expressway and one main divided highway. Highland Road widens out to a boulevard divided highway again. MD 173 crosses a CSX railroad line and expands to a divided highway. The highway passes through Woodboro and expands to a divided highway into Rhinelander. On August 30, 2000, of four-lane divided highway was let to construction. Ritchie Highway became a divided highway in 1950. The route included new overpasses, bridges, the Canmore Bypass,and 4 lane divided highway. Multiple washouts caused the closure of the divided highway between Monterrey and Saltillo, Coahuila. The route becomes four lanes again and continues through forests, becoming a divided highway. The entire route is a four-lane divided highway.