Companies responsible for traffic management during roadworks on state roads will be slapped with fines of up to $1250 if they leave speed limit signs out when they are not required.
The new regulations, which begin April 5, seek to keep both workers and motorists safe without unnecessary disruptions.
It means fines can now be issued to any contractor who breaches their permit conditions.
Infrastructure and Transport Minister Corey Wingard said the new measures come as the state records a $16.7 billion infrastructure spend over the next four years with road works occurring across the state.
"This is ensuring that contractors don't leave speed limit signs up when they're not needed, holding up traffic and creating unnecessary disruptions," the minister said.
In addition, the minister has since written to stakeholders that are major road traffic management companies who are pre-approved to undertake traffic management on DIT roads to inform them of the changes.
The Traffic Management Association of Australia treasurer Andrew White has applauded the introduction of The Regulations, which build on the existing Road Traffic Act.
Mr White said it would provide an educative function for companies involved in traffic management and assist with compliance.
"Safety is central to our industry and The Regulations will provide a platform to introduce and educate the industry and the public in regulatory safety on and around roadworks," Mr White added.