Listen up, hoggers of the right-hand lane – you're on notice.

NSW Police issued 174 fines to drivers on Wednesday for not keeping left on the state's busiest roadways, including the M4, M5 and M7 in Sydney.

It was one of the first times police have specifically targeted motorists for the offence in a long time.

And they have indicated they will do it again to ensure Sydney's increasingly congested motorways are not made worse by long lines of vehicles queuing up behind motorists who fail to keep left.