Editor's Note: This article is part of Inc.'s weekly report on business niches in partnership with financial information company Sageworks

Entrepreneurs whose companies build America's highways, streets and bridges have never been busier.

During the past 12 months, sales growth for private companies in the highway, street and bridge construction industry has more than doubled, rising from about 6 percent to roughly 14 percent, according to financial information company Sageworks. Net profit margin for this industry has also increased from 2.7 percent to 4.7 percent. 

The spike in sales growth is "in part related to the more systemic growth we've seen in the overall construction sector," says Sageworks analyst Libby Bierman, adding that other construction sub-industries have also seen increases in both net profit margins and sales growth. Growth from both consumers and businesses increasingly building or remodeling--whether it’s houses, utility projects or infrastructure projects--appears to have filtered down to the private companies that build the necessary roads and highways.

Despite the increase in sales growth and net profit margin for highway construction companies, the Highway Trust Fund's road construction account is expected to experience a loss in funds by the end of the 2015 fiscal year, according to the U.S. Department of Transportation. The majority of highway construction initiatives in the U.S. are funded by the tax-dollar supported Highway Trust Fund.

If the Highway Trust Fund reaches insolvency the first week of September, major highway projects would stall, Bierman says, adding that some of the high growth in the highway construction industry is attributed to government spending.

"If the Highway Trust Fund is depleted, the revenue coming from the government could abruptly end for these businesses," Bierman says. "The insolvency of the fund would likely cause problems for private businesses in the industry." 

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