The debate over increasing the size and weight of trucks in the House transportation authorization bill continues. Athough an amendment to the bill allows a three-year study of the impact of heavier trucks, longer twin trailers are still part of the bill, and advocates continue to push for the heavier trucks. Opponents have safety and highway maintenance concerns. "Any time we add more weight to our roadways, it increases how quickly they deteriorate. So we're not only worried about our interstates but, here in Missouri, we have about 28,000 miles of roads that are more farm-to-market type roads, and we worry about those roads, because they certainly aren't built to handle those heavier weights," said Becky Baltz, the Missouri Department of Transportation district engineer in Springfield.