Some graffiti popping up on highways has a lot of people talking, and the state isn't too happy about how a group of vandals are trying to get their message across.

Eyewitness News explains what it all means and the lengths one state agency is going to cut down on it.

When people drive around central Connecticut, it's hard to miss some of the graffiti popping up on bridges, overpasses and road signs that says "9-11 Truth," "W-T-C" and "Building 7."

All the phrases are scrawled across overpasses on some major highways. The Connecticut Department of Transportation is fed up with graffiti and doesn't have enough resources to keep up with it.

"It's finite resources," said Kevin Nursick, who is spokesman for the Connecticut DOT. "There are a lot of needs out there. There are limited funds."

And it's the taxpayers picking up the tab to clean it all up.

"I would estimate that annually we spend probably half a million to a million dollars dealing with graffiti," Nursick said.

But what does "9-11 Truth" even mean? And who is climbing up on bridges to do it?

Wayne Coste is a member of a group called the architects and engineers for 9-11 Truth. Coste said he's not sure who the vandals are, but he does know about the message they are trying to spread.

"The official story about what happened doesn't seem to add up," Coste said.

Coste, who is a structural engineer, got involved with the group about three years ago to try to answer his own lingering questions about the science behind the building collapses on 9/11.

As for what the "Building 7" graffiti refers to, Coste said, "Most people don't even know that a third major skyscraper was destroyed on 9/11."

Building 7 wasn't hit by a plane, but collapsed after a fire. People such as Coste contend the science behind that explanation doesn't add up and believe an explosion brought it down.

Coste said he doesn't condone the graffiti, but could see why it would be showing up

"There's somebody that's frustrated that the story isn't getting out," Coste said.