Scaling Cleaner Freight Movement

Cab & Roof Extenders

These devices close the gap between the tractor and the trailer by extending the vehicle side surface into the gap while ideally not interfering with trailer swing and dip motions.

The purpose of cab and roof extenders is to restrict the airflow from entering into the trailer gap by shortening the effective tractor/trailer gap width to route air over and around the gap to the trailer.

Without extenders, air leaving the rear edge of the tractor would hit the front edge and face of the trailer causing an increase in drag.


Fuel Savings (If Coupled with Higher Capacity and Higher Voltage Electrical System)


Not Available for Most Vehicles as of March 2017

Increased Complexity of Electrical System

Higher Electrical System Voltage and Power Output Required

Reliability Issues

Increased Maintenance Costs

To learn more, download the Tractor Aerodynamics Confidence Report.
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