Incidents and Accidents

It was a rainy morning today and I had to drive to Raleigh to record a podcast. I didn’t need to leave until well after rush hour, but I looked at the map to see how long it would take me while there was still a lot of traffic. The map showed 3 incidents and 3 accidents. I can find many explanations about the difference between these two words, however in a traffic context, it seems to mainly refer to the severity.