Samenvatting
In this paper, the specific noise procedures by which the new jersey department of transportation (NJDOT) studies and constructs noise mitigation measures are discussed. Details on NJDOT's noise impact definition and environmental process are provided, along with a summary of NJDOT's noise mitigation program that highlights the type and cost of such measures. In addition, specific mitigation projects are presented as examples of concrete, wood, and metal freestanding walls. Two environmentally sensitive projects, I-78 Watchung and I-295/I-195, are discussed in depth. Finally, NJDOT's standardised designs for concrete and wooden walls are described.