Question

3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 near Grand Island, NE. The following results were recorded. Position from start of road section Vehicle 2000 2300 1700 1200 600 2940 3200 2400 2100 1730 1000 2 3 4 Plot the trajectories of the vehicles on graph paper and compute the average flow (vph), density (veh/mi) and space mean speed (mph) over the 3000 ft length of the lane.

Answer 1

find reb m 3 spance mean spced? osition fom Stast of d ehical boto 3 2 00 2400 2. 2860 1260 +80 St calculota Aeose vgby 꽥(photo 2-photo-D 2440-2000 o 2oo O 20 Vi- 31.33 tise time

32oo 2300 oftIsec 23.33 TIsec 30 f sec 0 0 2 0 31.83+30+23.33+ 30+3 66+33. 6 V30.t sec 30 x60 x60)

Calculate densty (ab /mi length of he lane 3000 X 163 x 11348 step ol clat space menr Stea So n 3-92 30 2333 30 37.6 33.66