Police are investigating a fatal crash at Mount Light, near Naracoorte.

Emergency services responded to the single vehicle crash on Caves Road, Mount Light at 3.30am on Saturday. The collision sparked a fire.

Sadly, the driver, who was the only occupant of the car, a 25-year-old Naracoorte woman, died at the scene.

Caves Road was closed between the Riddoch Highway and Old Caves Road while Major Crash investigators attended and examined the scene.

Meanwhile, local police were kept busy with a range of incidents across the weekend.

Two people were charged with drug trafficking after being pulled over by police at Mount Gambier.

About 1.15pm on Friday police stopped and searched a vehicle on Penola Road.

The driver, a 30-year-old Padthaway woman and her passenger, a 26-year-old Kingston SE man, were arrested for trafficking in a controlled drug after a quantity of suspected methamphetamine and other drug paraphernalia was located in the vehicle.

The driver also tested positive for drug driving. The sample was sent for forensic testing.

They were bailed to appear in the Mount Gambier Magistrates Court on September 27.

In a separate incident, police are seeking the assistance of the public to identify a driver and locate a car that reversed into a police car last week.

At 9.30pm on Thursday, police stopped a silver Holden Cruze on Pick Avenue, Mount Gambier, registration S965CNL.

The driver allegedly reversed into the police car before taking off at speed. There were no injuries.

The driver and vehicle have not yet been located.

At 4.15pm on Saturday, police stopped a vehicle on Wehl Street North, Mount Gambier.

The driver, a 54-year-old Mount Gambier man, failed to comply with breath analysis and was reported.

He lost his licence on the spot for 12 months and his vehicle was impounded for 28 days. He will be summonsed to appear in court at a later date.

In the early hours of Sunday morning, police detected a 48-year-old OB Flat man driving while suspended and in contravention of a driver direction notice on Commercial Street West, Mount Gambier.

He was reported for driving while suspended, his vehicle was impounded and he will be summonsed to appear in court at a later date.

At 2am on Sunday, police stopped a vehicle in Queens Avenue, Mount Gambier.

Police checks revealed the 18-year-old female driver had never held a licence. She was reported and will face court at a later date.