DEN Fleet Maintenance provides to airport vendors a State Emissions Test Center to confirm their Compressed Natural Gas (CNG) vehicles/equipment/tugs meet all requirements for operation in the tunnels. All non-electric vehicles operating in the airport tunnels are required to be tested annually. If the vehicle/equipment/tug passes the test, they are permitted for one year to operate in the airport tunnels. Upon successful completion of the test, DEN Fleet Maintenance will install a registered permit sticker on the vehicle/equipment/tug that shows the date of expiration.
Click here to schedule a test for your vehicle.