A Perth driver has been hit with a $50 fine for driving too slow in the right-hand lane while travelling on Tonkin Highway on Tuesday morning.

Gosnells police officers, who were travelling behind the driver, pulled the car over after realising they were doing 90 kilometres an hour in a 100 kilometre zone.

The fine a Perth driver copped for driving in the right lane. Credit:Twitter

"In the right-hand lane, doing 90, with one of these behind you (a police car), not overtaking... you'll be getting a ticket," WA Police Traffic tweeted.

The fine comes two months after another Perth driver copped a similar fine for driving in the right hand lane on the same highway in Champion Lakes, east of Perth.