At an early stage of a crack self-healing pavement would activate super absorbent polymers to absorb water and produce concrete-like material that fills in the crack.
Every day, Americans travel on roads, bridges, and highways without considering the safety or reliability of these structures. Yet much of the transportation infrastructure in the US is outdated, deteriorating, and badly in need of repair.

Of the 614,387 bridges in the US, for example, 39 percent are older than their designed lifetimes, while nearly 10 percent are structurally deficient, meaning they could begin to break down faster or, worse, be vulnerable to catastrophic failure.