Question 2 [10] The trajectories (time-space diagrams) of a group of vehicles were recorded at a site from a US motorway (i.e. NGSIM data, see figure 1 below). The data are given in the spreadsheet "Assignment One Question 2.xls" in this unit's Moodle site. 700 Vehicle Trajectory 500 400 Postition (m) 300 N 200 100 790 and A10 A70 ARC Time (s) Figure 1: NGSIM data. Left: data collection site. Right: time-space diagram of 8 vehicles. See all in the excel file with answers a) Calculate the average spacing (i.e. the space headway) of the vehicles at different time steps given in the excel sheet [3]