WASHINGTON — Improving economic conditions are likely to put new stresses on the nation’s roads, airports and ports in 2011, but congressional gridlock could stymie efforts to pass already delayed funding packages for capital investments in surface transportation and the air-travel network.

A long-term highway bill could be stuck until 2013, and airport bond proposals that have been circling for years may not be cleared to land in 2011 either, market participants said in recent interviews about the outlook for next year.

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