![](https://infrastructureusa.org/wp-content/uploads/2016/05/arizona-dot-the-deep-foam-inject-300x300.jpg)
ADOT is injecting foam deep underneath the pavement as a way to smooth out dips on Arizona highways, including the Loop 101 Pima Freeway. This method is more cost efficient than ripping out old pavement, re-compacting the sub-grade, and placing new concrete or asphalt.
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