I found it! Those repeating sets of triple holes in the highway are to install reinforcing rebar. I was looking for a picture to illustrate what I was talking about, and found this DOT article.
In July, traffic was switched off a test section of I-94 to allow crews to install reinforcing dowel rebar inbetween concrete section joints. The concrete dates back to the 1970's and the dowel bars that were installed have deteriorated to a point of being ineffective. Due to this, the overall ride was very bumpy.
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The quarter-mile test project will assist in controlling concrete movements at the joints which is caused by Minnesota's seasonal changing temperatures and traffic loads.
Crews first sawed and hammered out three 18" lengths of concrete in each of the right lane tire treads. The new epoxy-coated rebar was then placed onto a foam stand in the cutout sections.
The reason the rebar is placed on foam stands is to ensure that the newly poured concrete will completely surround the rebar.
It is hoped that through constructing this research section, future dowel bar retrofit type repairs will be deemed cost effective on older concrete road pavements.
The $45,000 project was funded by the Destination/Innovation Fund administered by Central Office.
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