The sensors are designed to be affordable: an average - sized highway bridge would need about 500 sensors costing a total of about $ 10,000. (scientificamerican.com)
I once heard a child psychologist say that raising a child is like letting them walk the median of a very wide, 4 - lane highway bridge. (edutopia.org)
* About 9 percent of highway bridges were considered structurally deficient in 2017. (cnbc.com)