Click here for an archive of Cramer's "Mad Money" recaps. "I will do anything to help you make money, including working on the chain gang," Jim Cramer told "Mad Money" viewers Friday. Cramer told viewers that there is a boom in road building, or highway construction, in the U.S. He said there has been a 13% increase in highway and street spending, and new highway contracts were up over 25%. In California, according to last week's Los Angeles Times, there's $140 billion worth of highway construction to be done, he says. "It's the perfect kind of pork we like on 'Mad Money' because it creates jobs," he said and promised to explain to viewers how to play the road-building boom during the remainder of the show. The first way to play the pork is by buying stock in the rock companies. There are two really fabulous rock companies, Vulcan Materials ( VMC) and Martin Marietta Materials ( MLM), which are the No. 1 and No. 2 producers of crushed rock, he says. "Both are dirt cheap," he said. "They have both fallen hard. But aggregate pricing has remained strong." Plus, Cramer added, the Chinese and Indians can't undercut on price because it costs too much to ship rocks. Stealth bull markets are the sexiest kind, Cramer said, continuing his explanation of how to play the road-building bonanza.