The South Australian Government has announced increases to a raft of fees, fines and charges ahead of next month's state budget.

Key points: SA speeding fines are set to increase by up to 60 per cent

SA speeding fines are set to increase by up to 60 per cent Treasurer Rob Lucas hopes to make up for $500 million in lost GST revenue

Treasurer Rob Lucas hopes to make up for $500 million in lost GST revenue The Liberal Party criticised the former Labor government's reliance on speeding fine revenue before last year's election

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 30–45kph 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.

Currently, businesses can pay a $300 fine, and the individual does not receive demerit points.

"We're going to increase the corporate fee from $300 to $1,800, so 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, but because of the current structure, haven't done so," Mr Lucas said.

The highest speeding fine would still be about $900 lower than the top fine in New South Wales, which also has double demerit points during holiday periods, unlike South Australia.

Mr Lucas said the increase in various fees and charges make up about $79 million of a $500 million reduction in expected GST revenue.

Treasurer Rob Lucas handed down his first budget last year. ( ABC Radio Adelaide: Malcolm Sutton )

He said he had no qualms about increasing fines for speeding drivers.

"I've got no sympathy at all," he said.

"As [former treasurer] Kevin Foley said, this is a voluntary form of taxation, you don't have to pay speeding fines of any size," Mr Lucas said.

"If you decide you're going to speed at 30, 40 or 50kph greater than the speed limit, then you deserve to be whacked."

Hospital parking fees will also increase, while late-night venues will pay more in liquor licensing fees.

Public transport fares will go up by 1.7 per cent and short-distance tickets will be eliminated.

The Treasurer said people were "rorting" two-section tickets by staying on longer than allowed.

Compulsory third-party car insurance premiums will decrease by up to $114 under the competitive privatised model coming in on July 1.

Opposition says fee increases are a broken promise

Shadow treasurer Stephen Mullighan said the Liberal Party had broken its 2018 election promise to lower costs.

"It doesn't matter if you're a motorist, a public transport user, a tradie or a hospital worker, no South Australian is safe from this massive hike in fees and charges," Mr Mullighan said.

"This is an attack on households, an attack on businesses and an attack on South Australians who are just trying to manage their cost of living at a time of low inflation and low growth in their wages."

A speed camera audit resulted in cameras being added. ( ABC TV )

South Australian Council of Social Service chief executive Ross Womersley said people on low incomes would be the hardest hit.

"Most people on high incomes will accommodate fees and fine increases much more easily than those people who are living on low incomes across our community," he said.

Before the state election in March last year, the Liberal Party criticised the then Labor government for speeding fine revenue increasing by more than 100 per cent over the previous 10 years to more than $141 million.

"South Australians need assurance that speed cameras aren't being used as a cash cow for the government and are solely dedicated to locations where their use will reduce the number of accidents on our roads," the Liberals' pre-election policy said.

An audit last year found speed and red light cameras mostly did help reduce crashes.

Police Minister Corey Wingard then announced 10 new locations for the devices.

The State Government also quadrupled fines for cannabis possession last year, but backed down on a measure to introduce jail terms for possession.