YOU might have spotted wacky vehicles driving through town on the weekend. Don't worry - it was all for a good cause.

The 140 competitors in the Cystic Fibrosis Great Escape rally took a detour through the Maranoa across Saturday and Sunday thanks to the washing out of the Birdsville Races.

Featuring participants from six states and territories, most brought their incredibly colourful cars and trucks to the Roma Bowls Club on Saturday night, where they ran a calcutta based on the 1962 Melbourne Cup.

Ex-Roma police officer and rally photographer Ian Jensen said it was nice to return to town to see how it had evolved since he left.

"Roma has changed a lot - it was a nice big country town and it's gotten a lot bigger and it's more modern,” Mr Jensen said.

Track boss Terry Stewart, who is a former CEO of Cystic Fibrosis Federation Australia, said the rally raises money every year to find cures for CF.