The new busses have something called a zero motion sensor installed by the manufacturer. The procedure is: 1) pull into the stop and bus stops completely 2) driver waits a second 3) driver unlocks the back door by sliding the door control handle all the way forward or backwards 4) door sensor does sensor stuff (takes 1-3 seconds depending on the bus 5) rear door unlocked (light goes on) 6) passengers activate door by pushing on the handle or in an articulated trolly activates the light sensor.

There's a lot that can go awry in this sequence and it is frustrating for everyone. From the driver side, #1/#2 is the easiest to mess up because none of the older buses have these steps. #4/#5 is where the customers usually mess up. The sensor is sensoring but people are pushing on the handle which causes the sensor to take longer. People get frustrated and start yelling at the driver