Severity of Incidents

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Severity of Incidents

Each traffic incident has a severity attribute which is a number between 0 to 4. But, what does this number mean? When we have an accident with severity 4, is that a fatal accident? How this severity has been determined? And how that can be interpreted? 

Severity is an indication
Severity is an indication/range of the effect the incident has on traffic, not the severity of the incident itself. A severity 4 is a long traffic delay, not a high speed accident.