A man who pulled out of a line of cars waiting at a breath-testing station soon after crashed his car, killing himself and a two-year-old passenger, Tasmania Police say.

In a statement, police said the 19-year-old man from Midway Point and the female toddler, also from Midway Point, were killed in the single vehicle crash on the Tasman Highway, in Sorell, about 9.10pm on Thursday.

A female passenger survived the crash.

“Police were conducting a static random breath-testing (RBT) site on the Tasman Highway Midway Point at the roundabout with Penna Road,” police said.

They said the man’s car stopped in the line of traffic before it made a U-turn and travelled back towards Sorell, overtaking other vehicles.

Sand on the road used to extinguish the fire where the front half of the car came to rest, with the pole in the background. Photo: ABC

The driver soon after lost control, hitting a pole, with the impact causing the vehicle to break into two.

“The rear of the vehicle remained in contact with the pole and the front came to rest in the westbound lane,” police said.

“On impact with the pole the rear of the vehicle caught fire and was engulfed in flames. Unfortunately the toddler, who was in the rear, could not be saved.”

Police said the male driver and a front seat passenger were thrown from the front of the vehicle.

“The driver was declared deceased at the scene. The female passenger was conveyed to the Royal Hobart Hospital with non-life threatening injuries.”

Police are seeking information from any member of the public who may have been in the RBT line and witnessed the crash.