It's greenfields over brownfields as the Pennsylvania Turnpike Commission last week announced that it would evaluate bringing in a private company to finance, build, and operate 50-miles of new toll roads south of Pittsburgh.

At the same time, the authority maintains its opposition to the state leasing out the 530-mile Turnpike for $12.8 billion to Citi and Abertis Infraestructuras in a 75-year agreement. Yet PTC officials say public-private partnerships on new infrastructure developments, or greenfields, are more cost-effective than long-term lease transactions on pre-existing structures, called brownfields.

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