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The fast track. >> reporter: if you think traffic is fast in texas now, just wait. legislation is working its way through the texas state house to allow future highways to have speed limits up to 85 miles per hour. texas already has more than 500 miles of rural interstate that allow 80 miles an hour. none of those are any other existing roads would change. the 85-mile-per-hour limit would only apply to new construction on roads engineered for that speed and only at the texas transportation commission approves. backers say it's just another tool in the toolbox. >> we have lots of ground to cove...

The fast track. >> reporter: if you think traffic is fast in texas now, just wait. legislation is working its way through the texas state house to allow future highways to have speed limits up to 85 miles per hour. texas already has more than 500 miles of rural interstate that allow 80 miles an hour. none of those are any other existing roads would change. the 85-mile-per-hour limit would only apply to new construction on roads engineered for that speed and only at the texas transportation commission approves. backers say it's just another tool in the toolbox. >> we have lots of ground to cove...