Why does the waiting time increase or stay the same for a number of minutes sometimes?

15.8.18

Real time information predicts the actual time of arrival by knowing where the bus is currently located. Your bus could arrive right at the time shown or it could occasionally get stuck in traffic so the arrival time on display at the bus stop can sometimes change back and forward accordingly.  This service aims to provide the most immediate and accurate information to the waiting passenger at that point in time.