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Driving Notes

Subaru's Rear Automatic Braking System

August 31, 2016, by - Also by this author

Photo by Vince Taroc.
Photo by Vince Taroc.

The Subaru Outback returns for the 2017 model year with a feature that could help fleets reduce the risk of low speed collisions that occur while the driver is backing up the vehicle.

The Outback, and several other 2017 Subaru vehicles, can now be equipped with Reverse Automatic Braking, an enhancement to the EyeSight safety and driver-assisting system. We're familiar with forward automatic braking systems — also known as collision avoidance systems — that can brake or steer the vehicle to avoid or lessen the impact of an imminent collision.

Photo by Paul Clinton.
Photo by Paul Clinton.

These systems use forward-facing sensors and calibrate speed and proximity to vehicles on the roadway ahead. This technology is widely credited to a team of engineers at Hughes Research Laboratories in Malibu, Calif., who first demonstrated a radar-based system in 1995. Early adopters of forward warning systems included the Lexus SC400 and Cadillac STS. Automakers have agreed to make forward automatic braking a standard feature by 2022.

OK, back to Subaru. Their new rear automatic braking system functions similarly to the forward systems, but at lower speeds. After testing it, I can attest that it would help combat distracted backing and add an extra layer of protection of smaller objects behind the vehicle such as children or lower walls and poles.

Here's how the system works. Rather than being radar based, the system is sonar based. It uses four small sensors mounted to the rear bumper that appear as 2-inch dots to the naked eye.

Photo by Paul Clinton.
Photo by Paul Clinton.

You can tell the system is engaged, when you see "RAB On" displayed in the lower left corner of the dashboard display when you put the vehicle into reverse. This is coupled with the warning, "Check Surroundings Before Backing Up."

The sonar sensors begin detecting objects in a 5-foot field behind the vehicle and 6 inches outside the width of the rear end. The system operates when the vehicle is traveling up to 9 mph.

It provides progressive audible alerts at first, and then reduces engine power when a collision is imminent. If the driver fails to apply brakes, the system will panic-stop the vehicle, and informs the driver to apply brakes to keep the vehicle from rolling away. If the driver doesn't apply the brake, the vehicle will activate the electric parking brake.

The system will be cancelled if the driver presses the brake pedal or accelerator.

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Author Bio

Amy Winter-Hercher

Senior Editor

Amy is an associate editor for Auto Rental News and Business Fleet.

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Chris Brown

Executive Editor

Chris is the executive editor of Business Fleet Magazine and Auto Rental News. He covers all aspects of the fleet world.

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Chris Wolski

Managing Editor

Chris works on Automotive Fleet, Fleet Financials, Work Truck, and Green Fleet. He edits the Global Fleet Management eNewsletter.

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Mike Antich

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Mike has covered fleet management and remarketing for more than 20 years and entered the Fleet Hall of Fame in 2010.

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Paul Clinton

Senior Web Editor

Paul is the senior web editor for Automotive Fleet, Fleet Financials, Government Fleet, Green Fleet, and Work Truck.

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Thi Dao

Executive Editor

Thi is the executive editor of Government Fleet magazine. She is interested in maintenance management and alternative fuels.

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