A truck driver gets pulled over on a straight highway for driving faster than the 21 m/s speed limit. The police officer states the truck driver was going faster than the speed limit based on the instantaneous velocities provided in the table.

Time (s)	Instantaneous Velocity (m/s)
0	10 m/s
1	15 m/s
2	18 m/s
3	21 m/s
4	25 m/s
5	25 m/s
6	21 m/s

The truck driver claims that the truck's average velocity never exceeded 21 m/s. Why would the average velocity not be an accurate way to determine if a vehicle was above the speed limit? Use examples of data from the table in your response.