DALLAS — Analysts say that debt ratings for international toll bridges in Texas are bearing up under the stress of continuing drug violence in Mexico and recent traffic declines due to additional crossing points.

Twenty-six of the 42 border-crossing points along the nearly 2,000-mile U.S.-Mexico border are in Texas. Financially challenged cities on both sides of the Rio Grande are racing to exploit the commercial traffic through those crossing points, which is expected to grow dramatically if Mexico builds the new seaport envisioned for its west coast.

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