The A31 was closed for more than three hours overnight after a vehicle caught fire after a crash.
Emergency services were sent to the scene near Ferndown around 10.25pm on Thursday night.
Fire crews from Ferndown and Redhill attended the crash and extinguished one of the vehicles which was on fire.
Both vehicles were made safe by disconnecting the batteries.
A small quantity of engine oil was absorbed from the highway using Environment Agency pads, which are carried on fire engines.
A spokesperson for National Highways warned motorists the road was closed and said: "The A31 is closed in both directions between the A348 and B3072 near Ferndown due to a collision. Emergency services including Dorset Police are on the scene and dealing.
"Please allow extra travel time if in the area."
A spokesperson for Dorset Police said: "We received a report at 10.13pm on Thursday December 8 of a two-vehicle road traffic collision on the A31 westbound carriageway between the Parmersford and Ameysford roundabouts near Ferndown.
"Officers attended along with the fire and ambulance services.
"There were no reports of any injuries, however it was reported that there was fuel and debris in the road and closures were put in place.
"The road was cleared and officers left the scene shortly after 1am."