Why does one stretch of a bus route take three times longer per kilometer than another? You divide a section of a real bus route into segments and ride it for 23 school days with a stopwatch. You pause the timer during boarding stops to isolate pure travel time. Then you calculate the average time per kilometer for each segment. The slowest segment near a train station takes 298 seconds per kilometer. The fastest segment takes only 99 seconds per kilometer. Travel time also varies by day of the week. Fridays average over 33 minutes while Wednesdays average under 29 minutes. Segments with more lanes tend to be faster. Single-lane segments show the widest variation at 418%.