Heavy Duty Trucking Logo
MenuMENU
SearchSEARCH

Time Running out for CARB Compliance on Trailer Aerodynamics

Jan. 1, 2013, will bring heavy fines for truckers who cross into California without SmartWay verified aerodynamic devices such side skirts or boat tail fairings that improve fuel economy 4% to 5% on their 53-foot or longer box and refrigerated trailers

by Staff
October 15, 2012
3 min to read


Jan. 1, 2013, will bring heavy fines for truckers who cross into California without SmartWay verified aerodynamic devices such side skirts or boat tail fairings that improve fuel economy 4% to 5% on their 53-foot or longer box and refrigerated trailers.


"The clock is ticking for compliance," says Randy Rhondeau, air pollution specialist for California's Air Resources Board. "Fleets and owner-operators who travel into California must have aerodynamic devices, unless they registered with CARB on a phase-in option (which provides an alternate compliance schedule)."

If you're pulled over for non-compliance, the owner of the tractor-trailer can be cited $1,000 per day, Rhondeau says.

"The driver of the tractor-trailer is not off the hook either - that person can be fined $1,000 a day as well. Fines can increase to $10,000 per day for egregious, repeat offenders."

Rhondeau said ignorance is not bliss. "Information has been out there for quite some time, so if someone comes in and pleads ignorance, it's not going to hold water. If we catch violators, they're getting a citation."

According to Sean Graham, president of Freight Wing, makers of SmartWay-verified trailer side skirts and gap fairings, the CARB deadline is creating a dash for compliance. "We're fielding a lot of calls asking about what's needed," Graham says.

For fleets needing numerous trailers outfitted before the deadline, Graham said Freight Wing has put together mobile installation teams to help customers with fitments.

While the CARB mandate might seem to be heavy-handed government at work, Graham said that in this case in particular, aerodynamic fairings on trailers have a very fast payback.

"We've worked with many large fleets which have documented real-world fuel savings of up to 4% with our skirts," he said. "In testing, at sustained speeds, our SAE testing has shown up to a 7% improvement. If you do the math, our skirts can have a payback in as little as 35,000 miles of trailer utilization."

Low rolling resistance tires can improve fuel efficiency as well, but SmartWay verified tires cannot be used to help meet the 4% to 5% requirement. Nevertheless they will add an additional 3% improvement for both the tractor and trailer. SmartWay verified tires won't be required on 2010 and older box trailers until January 2017.

More info On CARB Trailer Aerodynamics

According to Rhondeau, owners, drivers, fleet operators, California-based brokers, California-based shippers and motor carriers should be fully aware of all the rules.

CARB will allow a one-time per fleet per year (one tractor) exemption into the state for a trucking company or owner-operator, but the request must be to the CARB via an email or written request and approved before entering California.

In addition, if registered with CARB, local haul 53-foot trailers are exempt from the aerodynamic requirements of the rule, but they must not go beyond 100 miles from their home base. Empty trailers are also exempt. Short haul tractors and the trailers they pull are exempt, but the tractor must be entered into CARB's database and tractor mileage must be 50,000 miles or lower per year.

For complete information on rules go to:

CARB website: www.arb.ca.gov

CARB Truck Stop on the website: http://www.arb.ca.gov/msprog/truckstop/questions.php?page=diesel

CARB Greenhouse Gas Tractor-Trailer Program: http://www.arb.ca.gov/cc/hdghg/hdghg.htm

Subscribe to Our Newsletter

More Fuel Smarts

Woman with red hair superimposed on background showing a King Fio electric Volvo truck at the port, plus the HDT Truck Fleet Innovators 2026 logo
Fuel Smartsby Deborah LockridgeAugust 14, 2026

Jennie Abarca Is Proving Electric Trucks Can Do the Job

HDT Truck Fleet Innovator Jennie Abarca is building confidence in fleet electrification one load at a time while openly sharing the challenges she encounters along the way as a small-fleet owner.

Read More →
EquipmentJuly 23, 2026

Cummins Adjusts 2027 Engine Rollout After EPA Proposal

The engine maker will gradually introduce its new Model Year 2027 diesel engines while continuing to offer current models during the transition, citing the EPA's proposed emissions rule changes.

Read More →
Four men in suits on the National Mall with giant video screen showing capitol building in the background
Equipmentby Deborah LockridgeJuly 10, 2026

EPA Proposal Could Ease 2027 Truck Costs and Buying Uncertainty

The proposal doesn't change the tougher NOx standard, but it would revise key implementation requirements that manufacturers say have driven up costs and complicated fleet purchasing decisions.

Read More →
Ad Loading...
Illustration showing Paccar MX engine with sketch illustration of DEF fill tank in background
Equipmentby Deborah LockridgeJuly 7, 2026

Cummins, Paccar Ease DEF Derates After EPA Guidance

Updated diesel engine software gives truck operators more time to address emissions-system issues while staying compliant with EPA emissions standards.

Read More →
Illustration with wrenches in background with "Maintenance in the Messy Middle: Biodiesel" text and NACFE Run on Less logo
Maintenanceby Jack RobertsJuly 2, 2026

Maintenance in the Messy Middle Part 3: Biodiesel

Biodiesel can reduce emissions, improve fuel-system lubricity and use existing diesel infrastructure. But NACFE’s Messy Middle maintenance report says fleets must actively manage storage, cold-weather operation, filters and oil drain intervals to avoid problems.

Read More →
thermo king heavy duty trucking
Safety & ComplianceJuly 1, 2026

Enhance Fleet Performance with High-Efficiency Auxiliary Power Units

Drive sustainable cost savings while increasing driver comfort during short- and long-haul logistics operations.

Read More →
Ad Loading...
Illustration with wrenches in background with "Maintenance in the Messy Middle: Renewable Diesel" text and NACFE Run on Less logo
Maintenanceby Jack RobertsJune 29, 2026

Maintenance in the ‘Messy Middle’ Part 2: Renewable Diesel Fuel

NACFE's latest Messy Middle Powertrain Service & Maintenance report says renewable diesel gives fleets an opportunity to reduce carbon emissions without changing trucks, fueling infrastructure or maintenance practices. But technicians still need to understand several important operational differences.

Read More →
Illustration messy middle maintenance diesel with wrenches in background
Maintenanceby Jack RobertsJune 26, 2026

The Diesel Engine Enters NACFE’s ‘Messy Middle’

NACFE’s new Messy Middle Powertrain Service & Maintenance report says keeping modern diesel engines running now depends as much on software, diagnostics and data as traditional mechanical service.

Read More →
Illustration showing DEF tank and Detroit engine
Equipmentby Deborah LockridgeJune 18, 2026

DTNA Software Update Gives Truckers More Time Before DEF Derates Take Effect

The changes reflect EPA guidance aimed at reducing downtime caused by emissions-system faults while maintaining compliance requirements.

Read More →
Ad Loading...
Illustration of exhaust aftertreatment system on an AI-inspired blue background and a green fuel pump nozzle in the foreground.
Maintenanceby Deborah LockridgeJune 15, 2026

New Agentic Predictive Maintenance Report Demonstrates How Degraded Aftertreatment Systems Waste Fuel

Questar analyzed a large mixed-class fleet and discovered it was wasting as much as $30 in fuel per vehicle, per day, because of mechanically degraded aftertreatment systems.

Read More →