Cleaning up road kill and maintaining runways may not sound like cutting-edge investments. But banks and funds with big money seem to think so. Reeling from more exotic investments that imploded during the credit crisis, Kohlberg Kravis Roberts, the Carlyle Group, Goldman Sachs, Morgan Stanley and Credit Suisse are among the investors who have amassed an estimated $250 billion war chest — much of it raised in the last two years — to finance a tidal wave of infrastructure projects in the United States and overseas.
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