Airlines are starting to hedge against the risk that fuel prices could be driven higher by rules targeting another industry’s environmental performance.

Florida posted the biggest surge among states in the use of heavy-duty trucks with clean diesel engines in 2017, notching an 81% jump compared with a year earlier, according to data from IHS Markit. This increase came as fleet confidence in the technology took hold and more freight-hauling opportunities opened up in the nation’s fourth-largest state economy, other experts said.

The American Concrete Pavement Association has requested exemption from certain hours-of-service regulations from the Federal Motor Carrier Safety Administration.

Indiana Gov. Eric Holcomb’s recently announced $1 billion infrastructure plan will rely on a 35% increase to the rates that pertain to trucks on the Indiana Toll Road.