roughness from profile
three-point rut depth
falling weight deflection
verification of vertical and horizontal curves and other geometric data
Collected data must be accurate because important planning and design decisions based on this data are only as accurate as the data itself. Accurate decisions are vitally important in determining optimum program and design strategies. Data must also be timely and must satisfy regulatory requirements (for example, the federal Highway Performance Monitoring System) and the Departments internal and external information needs. To be efficient, the data collection effort must be well coordinated and make best use of available resources. Most importantly, the data collection program must foster credibility within and outside the Department.
Presently, the Department employs various methods to check validity of individual data items, but it has no comprehensive policy regarding field data collection. Not all data items have formally defined collection and validation procedures, and no integrated strategy for data collection exists. Research is needed to reconfirm the Departments roadway data needs, review its field data collection methods and quality control procedures, assess the accuracy of existing data, and either verify or recommend enhancements to its procedures. The research should consider the Federal Highway Administrations current efforts to define common protocols for measuring pavement roughness, rut depth, distress and faulting on the National Highway System.