A P-plater has lost his licence after he was allegedly caught driving more than 100 kilometres per hour above the speed limit on a regional South Australian highway.

Key points: The 28-year-old driver was allegedly clocked at 201kph

The 28-year-old driver was allegedly clocked at 201kph His car was pulled over at Barinia, just north of Clare in SA's mid north

His car was pulled over at Barinia, just north of Clare in SA's mid north The SA Government is planning to increase fines for excessive speeding

The man's Holden Commodore sedan was pulled over on the Horrocks Highway in the mid north after a patrol detected the car travelling at 201kph, police said.

The car was spotted at Barinia, just north of Clare, in a 100kph zone about 9:30pm on Friday, SA police said.

The driver, a 28-year-old man from Parafield Gardens in Adelaide's north, was fined for speeding and breaching the conditions of his provisional licence.

He also lost his licence for six months.

The incident comes days after another case of excessive speeding, involving a driver who was allegedly detected travelling at 147kph on the Stuart Highway in the state's far north on Wednesday afternoon.

The 24-year-old man from Oakden Hills was breath tested and allegedly returned an alcohol reading of 0.106, more than twice the legal limit.

He was also issued with a six-month instant loss of licence.

Speeding fines set to rise to curb road toll

Senior police have repeatedly pleaded with drivers to slow down because of an unusually high road death toll.

Muhammad Iqbal is the most recent SA road victim. ( Supplied )

Last month, the SA Government announced speeding fines would increase as a result of measures in the upcoming state budget, which will be handed down on Tuesday.

Some of the biggest increases are to fines for speeding more than 30 kilometres per hour over the limit, which will increase by 60 per cent.

The speeding fine for travelling at 30 to 45kph over the limit will increase from $920 to $1,472, while drivers going more than 45kph over will face a fine of $1,658 — up from $1,036.

Treasurer Rob Lucas said the Government would also significantly increase the fine for people who were caught speeding in a company car.

"We're going to increase the corporate fee from $300 to $1,800," Mr Lucas said.

"There'll be a very significant financial disincentive for bosses and companies to protect the brainless idiots within their business or company who are speeding and potentially should've been losing their licence."

On Wednesday, Mitchell Park man Muhammad Iqbal became South Australia's 55th road victim this year. At the same time last year, 35 people had died.

Mr Iqbal, originally from Pakistan, was struck by a van that mounted the kerb on Military Road at West Beach on Monday.

He suffered critical injuries and died in the Royal Adelaide Hospital on Wednesday afternoon.