Driving scores may be low even without triggering an event, this is due to the event threshold.
In the iDriveAware program, events are created when the severity of a behavior exceeds the threshold for that behavior. For example, a speeding event may only be triggered after exceeding speed limit by 10 miles / hour.
Alternatively, scores do not necessarily reflect how many events are triggered. You may never cross the event threshold, but still receive a low score because of the amount of times you exhibit poor driving behaviors.
The graph below shows an example of how the event threshold works. In the example, Driver A exceeds the speed limit once and triggers an event (more than 10mph). While Driver B never exceeds the speeding threshold but is constantly driving above the speed limit. Driver B will have a lower score than Driver A because speeding many times over that time period is more dangerous than speeding only once.