Driving offences cost MP road safety role

A string of driving offences have cost South Australian opposition road safety spokesman Tim Whetstone his licence and shadow portfolio.

Mr Whetstone said he made the decision after accumulating too many demerit points.

He will remain the opposition's spokesman for corrections, mental health and suicide prevention and community safety.

"I have had some recent traffic offences which mean it is now inappropriate for me to continue as shadow minister for road safety," Mr Whetstone said in a statement on Friday.

"Road safety is critical and it's important the opposition has a strong voice in this portfolio.

"I apologise to those that I have let down including the South Australian public as well as my colleagues."

Mr Whetstone said he came to his decision after meeting Opposition leader David Speirs.

Mr Speirs will take on the road safety portfolio until a permanent replacement is named.