A multilane highway has four lanes (two lanes in each direction) and a measured free-flow speed of 55 mi/h. One upgrade is 2% and 1.5 miles long. There are 3% Recreational Vehicles and 3% Tractor Trailer trucks in the traffic stream in the directional peak hour volume of 2000 vehicles with a peak hour factor of 0.85. What is the calculated density of the highway