Traffic delays are continuing following a crash on the N7 outbound near Citywest.
Dublin Fire Brigade (DFB) said crews from Tallaght Fire Station attended the collision near Junction 3.
Emergency services were concerned that passing motorists slowing down to view the incident could lead to further delays.
A DFB spokesperson said: "Traffic can pass, but there will be delays."
But he added: "Keep your eyes on the road - as you approach and pass."
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