Thirty people will be allowed from Friday to gather outdoors (up from 20), group bookings at hospitality venues will be extended from 10 to 30 people and up to 300 will be allowed at places of worship.

Staffing at gyms will also be relaxed, with a safety marshal only required when more than 20 people are working out.

These allowances come after NSW recorded just one new locally-acquired case in the 24 hours to 8pm on Wednesday.

But Premier Gladys Berejiklian has urged more people to wear masks on public transport and indicated more people could use the service if this happened.

"If we see mask-wearing goes back up, we can increase the number of people who can use public transport," she told reporters on Thursday.

"We desperately need it to go back up."

Meanwhile, a coronavirus alert was issued for anyone who attended the Bathurst 1000 motor race last weekend after traces were found in the city's sewage.

NSW Health urged anyone in Bathurst to get tested even if they had mild symptoms of the virus and to remain in isolation until test results came back.

It also wants people in southeast Sydney to watch for symptoms after a person who was in the area on October 15 tested positive.

Several venues have now been identified as places of potential exposure including Souths Juniors Club at Kingsford, Century 21 Dixon Real Estate, in Kingsford and The Shed Cafe at Royal Randwick Shopping Centre.

Australian Associated Press