Police Minister Rob Johnson says he is confident police are not compromising road safety by refusing to issue fines for traffic offences.

Police yesterday stepped up their industrial campaign for more pay, with WA Police Union president-elect Russell Armstrong saying serious traffic offenders, including drink drivers, speeders, hoons and motorists driving under the influence of drugs, would escape on-the-spot police fines of up to $1000 but would still face court action.

Minor offenders, such as drivers who failed to indicate, would avoid fines and escape with a caution.

Mr Johnson said he was not concerned by the police strategy and was "confident that our police officers will carry out their duties in a very responsible way".

"They have the discretion to either issue an infringement or issue a caution - that is their discretion anyway under the law" he said.

"I don't believe that our police officers would in any way compromise either road safety or community safety."

Mr Armstrong warned last night that if the Government did not improve its pay offer significantly at a meeting tomorrow, the union would step up its campaign, but he would not reveal details.

He said yesterday that Treasurer Troy Buswell had stated on Tuesday that negotiators would present a new deal yesterday after the parties failed to agree on the Government's first offer of a 9.5 per cent rise over three years, or 9.8 per cent calculated cumulatively.

PERTH RONAN O'CONNELL