1.. Please show work and steps. If an approach has a PHF of 0.90 and a counted hourly volume of 800 veh/hr what is the maximum 15-minute volume and peak rate of flow? What is the highest and lowest possible value of PHF? At a given location, the space mean speed is measured as 70 mph and the rate of flow as 2200 pc/h/ln. What is the density at this location for the analysis period? How could you decrease the density by 10%?