Christian Claudel University of Texas at Austin This talk describes a framework for solving control and estimation problems in systems modeled by scalar conservation laws with convex flux, with applications to highway traffic flow estimation and control. Using an equivalent Hamilton-Jacobi formulation, we show that the be solution to the original PDE can be written semi-analytically. Using the properties of the solutions to HJ PDEs, we prove that when the data of the problem is prescribed in piecewise affine form, the constraints of the model are mixed integer linear. This property enables us to solve arbitrary network state estimation problems involving any type of measurement data (density, flow, velocity and travel time) exactly and efficiently. This framework is applied to a network traffic state estimation problem involving experimental data.