Nearly two dozen directors of states' largest program have resigned in the last year.
Mayors say the U.S. Department of Transportation pilot program would help boost their local economies.
North Carolina is trying to recruit girls for careers in engineering not only to fill anticipated vacancies but also because hiring more women could make the roads safer.
Most local governments expect to hire some workers, but more will not only continue to leave vacancies unfilled but also anticipate an uptick in layoffs.
