ABSTRACT
A pilot project was conducted on 683-mile network of roadways in eastern Idaho with the goal of generating network-level roadway structure data to support future project planning and design efforts and advance the management of assets into a more efficient set of priorities. The roadways were surveyed continuously with a Traffic Speed Deflectometer (TSD) and with Ground Penetrating Radar (GPR) and 2-mile segments were selected for Falling Weight Deflectometer (FWD) testing to confirm the TSD data and calibrate in the TSD analysis. TSD and GPR data were combined to calculate subgrade modulus, effective structural number, and remaining life throughout the network. Using these results, the network was divided into “homogeneous” sub-segments of typical project length for the purpose of identifying and programming rehabilitation projects. The level of condition detail available at the subsegment level allows for the development of preliminary rehabilitation design without the need for additional data.
