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52 APPENDIX A U.S. State Transportation Departments' Input on Federal Regulations Departments of transportation (DOTs) were asked to com- Specific inspections: Routine intensity inspections at 24 ment on changes or improvements to inspection practice and months can supplement hands-on inspections at longer U.S. federal regulations for inspection programs. The most intervals. frequent responses were no input or the comment that exist- ing regulations are adequate. Other responses are listed here. Certification of Inspectors Bridge Routine Inspection Interval Three comments: Four comments by DOTs: There should be no certification of inspectors. The interval for routine inspection should be approxi- Certification of inspectors should include testing of ap- mately two years, and might be better stated as inspec- plicants. tion of a bridge in every second calendar year. This Certification should include an entry-level grade for in- would make inspection scheduling easier. spectors assigned to simple bridges only. The interval for routine inspection of a bridge should be 24 months only. Culverts might be inspected at longer intervals. Quality Control and Quality Assurance Inspectors should have the authority to set the interval Procedures to the next inspection of each bridge, but only to a max- imum interval of 24 months. Two points: The combination of bridge complexity and inspector qualifications should determine a matrix of inspection Procedures should be determined by state DOTs. intervals. Formal requirements should be developed at the federal level. Fracture-Critical Inspection Interval Two comments, both proposing longer intervals for some Additional Comment on Regulations for fracture-critical inspections: Bridge Inspection Specific bridges: A longer interval is appropriate for DOTs indicate a need for a central source of infor- bridges on low-volume roads, bridges with a low vol- mation and discussion of federal regulations and its ume of truck traffic, and bridges that have low stresses. interpretation.