"We expected the animals to take a while to get used to them," he said.
To their surprise, the koalas were using the structures three weeks in - seemingly proving you can teach the furry animal new tricks.
"You can, that's the point. I was the first sceptical person to say they're not that smart," said Jones.
The researchers used a range of technologies that allowed them to monitor whether koalas passed through the crossings and pinpointed individual koalas and the exact time they entered and left the tunnels.
Not only did the researchers discover koalas are smarter than first thought, but also that these experimental structures are working to keep them safe.
"Although we don't want the koalas to be disturbed, all over the place on the Gold Coast and in Brisbane there are special koala specific tunnels and ledges that are allowing them to cross. Those animals are not going to be hit anymore," said Jones.
The findings have been published by the CSIRO.
- AAP