Serious crash at Freeling: motorcyclist serious, driver arrested after allegedly fleeing Thiele Hwy scene

Police have arrested a driver who allegedly spoke to witnesses then unhooked his trailer and drove off after a crash that left a motorcyclist critical.

A driver has been arrested after spending more than 24 hours on the run following a bizarre crash that left a motorcyclist critical at Freeling.

About 6pm, Sunday police and emergency services were called to the Thiele Highway after reports that a car towing a trailer had crashed with a motorcycle.

Police said the driver of the car got out of his vehicle to speak to witnesses before unhooking his car trailer and driving off in a light-coloured tray-top ute.

A young driver is on the run after fleeing the scene of a crash on the Thiele Highway that has left a Morphett Vale motorcyclist fighting for life. Picture: 7NEWS

Police investigating a serious crash on the Thiele Highway at Freeling have released a photo of the suspect vehicle and trailer seen at Eudunda about 5.30pm yesterday. Picture: SA Police

The victim, a Morphett Vale man, 40, was later taken to the Royal Adelaide Hospital in a critical condition.

The 28-year-old driver of the utility, from Waikerie, was arrested in the northern suburbs on Tuesday night without incident.

He is expected to be charged with offences pertaining to the crash.

Police also recovered and seized the Holden utility allegedly involved in the crash from a Brahma Lodge address.