The　severity　of　traffic　accidents　in　the　tunnel　is　different　resulted　from　different　traffic　incidents.　Lots　of　attention　have　been　focused　on　the　theories　and　methods　of　incident　detection　in　the　vehicular　tunnel.　There　was　little　research　on　the　classification　of　the　traffic　incidents　along　the　freeway　tunnel　impact　area,　which　determine　the　response　efficiency　and　the　effectiveness　of　the　rescue.　This　study　was　trying　to　classify　the　traffic　incidents　influencing　on　driving　safety　along　the　freeway　tunnel　impact　area.　According　to　the　literature　review,　twenty-two　traffic　incidents　were　analyzed　and　three　types　were　proposed,　including　incidents　between　vehicles,　Individual　vehicle　incident,　and　others.　The　severities　were　determined　into　five　scales　and　the　expert　scoring　method　was　adopted　to　evaluate　the　severities　of　the　22　traffic　incidents.　At　the　same　time,　the　weights　of　different　levels　of　experts　were　determined　in　order　to　guarantee　the　statistical　significance　of　evaluation　results.　The　result　showed　that　professors　in　the　field　of　road　traffic　safety　and　senior　experts　for　traffic　accident　identification　have　the　most　weight　from　all　experts.　In　the　light　of　evaluation　results,　the　severities　were　classified　into　three　levels,　serious　incidents,　relatively　serious　incidents,　and　slightly　serious　incidents.　The　incident　fire　influence　on　the　driving　safety　the　most　along　the　freeway　tunnel　impact　area.　Finally,　the　responses　and　the　relative　agencies　were　proposed　for　the　three　classifications　respectively.　The　result　of　this　study　can　provide　guidance　for　the　emergency　responses　in　the　light　of　the　severities　of　traffic　incidents　happened　in　the　freeway　tunnel　impact　area.　©　2019　IEEE.