Afour-lane freeway (two lanes in each direction) operates at capacity during the peak hour. it has 11-ft lanes, 4-ft shoulders, and there are 3 ramps within 3 miles upstream of the segment midpoint and 4 ramps within 3 miles downstream of the segment midpoint. the freeway is on rolling terrain and has 8% heavy vehicles with a peak-hour factor of 0.85. it is known that 12% of the aadt occurs in the peak hour and that the directional factor is 0.6. what is the freeway's aadt?