First obtain the file CE 491 HW2 Data. xlsx from Canvas. The file contains 15 min average speed and count data for three stations on northbound Interstate 5 in Portland Oregon for one day, January 16, 2015. Note that the volume data are expressed in total volume across all lanes for each 15-minute period. It is most typical to express volume in the equivalent number of vehicles/hour. Divide the segment into three segments using the midpoint method (start at MP 302.5 and end at MP 307.7). Knowing the speed and length of each segment calculate segment travel time for each 15 minute period.