In preparation for a public hearing on a proposed interstate bypass at Nontroppo, Michigan, the county road commission has requested that you prepare an estimate of the potential for violation of FHA noise standards 75 meters from the interstate. Data for I-481 at Pianissimo Avenue estimated traffic: Automobiles: 7800 per hour at 88.5 km h1 Medium trucks: 520 per hour at 80.5 km h1 Heavy trucks: 650 per hour at 80.5 km h1 Compute the unattenuated Leq, at the receiver for autos only.