How do we measure? From July 2022, we measure the timeliness of all bus departures from all timing points, where no bus may depart early or more than four minutes late from a starting timing point or more than 6 minutes late from a mid-point timing point. Previously, this statistic was prepared using a sample of all bus trips operated, where no bus may depart early or more than four minutes late from any timing point
For more information, see our detailed information about our bus service reliability.