Dive summary:

• In Manitoba, Canada, the 32-year-old surface of Provincial Trunk Highway (PTH) 9 near Winnipeg had become a particularly rough ride in a two-mile section.
• Provincial officials  considered the alternatives of a bituminous overlay, a total rebuild and concrete preservation that used diamond grinding and full-depth and partial-depth repairs to joints.
• Going with the least-costly option, they were able to bring in the project at 42% less than the cost of the bituminous option and get a surface that reduced the road's International Roughness Index from 3.95 and 4.32 in the northbound and southbound lanes, respectively, to 2.13 and 1.83.

From the article:

Located in the Canadian province of Manitoba, Provincial Trunk Highway (PTH) 9 is a 53-mile-long provincial highway that runs from Winnipeg to Gimli. It is known as Main Street between Winnipeg and Selkirk. The 32-year-old concrete pavement required rehabilitation on a 2-mile section, due to transverse joint deterioration and uneven wear of the existing seal coat causing a rough ride. ...