When the student clicks the stop button to stop the green,
the signal will turn yellow and then red. The vehicles in the DZ
are displayed as red, and other vehicles are displayed in green.
The right panel group updated and displayed data regarding the
scenario’s performance given the student’s choice (i.e., update
the number of vehicles in DZ and delay and the history
performance). The game let the student choose replay or go to
the next level, up until the last level (i.e., level 5). A screenshot
of the game when green ends is shown in Fig. 6.