CHICAGO (AP) – When Illinois voters head to the polls in November, the first ballot question won’t be for presidential candidates, but a measure aimed at protecting the state’s transportation-related funding from being used for other purposes.

The proposed constitutional amendment seeks to prevent money generated through tolls, taxes and other transportation-related sources from being spent elsewhere. It’s the only lawmaker-generated ballot measure and was approved with overwhelming bipartisan support.

Backers include unions and the construction industry. They claim the so-called “lockbox amendment” will protect Illinois’ infrastructure and economy by ensuring money is used for road and bridge repair work and transportation jobs. They launched an ad campaign Tuesday.

To succeed, the measure needs either 60 percent of those voting on the measure or a majority of those voting in the election.