Security screens and perimeter fences could be installed at New South Wales police stations as the state's police union pushes for protections against another terrorist attack.

Key points: NSW Police Association wants increased protections against terrorist attacks for officers and staff

NSW Police Association wants increased protections against terrorist attacks for officers and staff Proposed measures include security screens and perimeter fences at stations

Proposed measures include security screens and perimeter fences at stations Association says new system means police will not be deployed alone in metropolitan areas at night

The NSW Police Association and NSW Police Force are in talks to strengthen security as a result of the fatal shooting of Curtis Cheng by a teenage extremist outside Parramatta's police headquarters on October 2.

Police association vice-president Pat Gooley said the force had agreed to develop processes to prevent officers being deployed alone in metropolitan areas at night.

"What we've done, through a process with the industrial commission, is work with the police force to come up with a system where police aren't deployed after dark on their own in metropolitan areas," Mr Gooley told Channel Nine.

"Certainly in other areas there's a very robust risk assessment process and we think that will keep a good balance between police safety and community safety."

Mr Gooley said risk assessments were being conducted at every police property.

"We've identified a number that require extra security," he said.

"Some of those will include perimeter fencing, some screens, some access control, and some of them are very safe at the moment."

Industrial commission fast-tracks mediation after shooting

The association initially raised concerns about officers working alone in a dispute filed in June at the Industrial Relations Commission (IRC) of NSW.

At the time, the association expressed concerns about single unit policing being conducted "in an environment of heightened risk, in particular the threat of a terrorist attack against police".

The dispute led to mediation with the NSW Police Force, including a process to identify risks.

In a statement last week, IRC president Michael Wilton said the mediation process had been expedited by the commission because of the Parramatta shooting.

He said both parties had made significant progress in identifying appropriate protocols and safety checklists, and to improve the safety of single unit officers, but he noted both parties had not been able to reach a final agreement.

The push comes as the State Government prepares to toughen bail laws to make it harder for people with terrorism links to get bail.

Under the legislation, to be introduced to Parliament today, courts would examine a defendant's associations with terrorist and extremist groups as well as consider previous terrorism-related convictions.

NSW Attorney-General Gabrielle Upton said the changes were a response to the joint NSW-Commonwealth review of the issues around last year's Martin Place siege.