The gist

Stops diesel trucks from automatically shutting down in freezing weather. Targets safety risks in Alaska and other cold regions where emissions systems fail and strand drivers.

Who wins, who loses

• Wins: Alaska truckers, rural emergency responders, diesel manufacturers, drivers in remote freezing areas.
• Loses: clean air advocates, communities concerned about diesel pollution and weakened Clean Air Act enforcement.

What it does

• Gives EPA 180 days to let manufacturers suspend engine derate and shutdown functions at or below 0°C.
• Requires engines to return to normal emissions control once temperatures rise above freezing.
• Grants year-round exemption from diesel exhaust fluid rules for vehicles operating north of 59° latitude.
• Blocks anyone except manufacturers from disabling these shutdown features.

Why should I care?

Supporters say frozen diesel exhaust fluid causes trucks to shut down in life-threatening cold, stranding drivers far from help. Critics argue any rollback of Clean Air Act protections opens the door to more diesel pollution and harder-to-enforce standards nationwide. An alternative being debated: better cold-weather fluid technology instead of regulatory exemptions. Where do you land? Vote below and use "Tell Your Rep" to make sure your voice reaches Congress.