In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the Sierra EV are reminded to check the back seat if they opened the rear door before starting out. The R1T doesn’t offer a back seat reminder.
The Sierra EV’s standard pretensioning seatbelts also sense rear collisions and remove slack from the front seatbelts to help protect the occupants from whiplash and other injuries. The R1T doesn’t offer a whiplash protection system.
Over 200 people are killed each year when backed over by motor vehicles. The Sierra EV has standard Reverse Automatic Braking that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The R1T doesn’t offer backup collision prevention brakes.
Both the Sierra EV and R1T have rear cross-traffic warning, but the Sierra EV has Rear Cross Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The R1T’s Rear Cross-Traffic Warning doesn’t automatically brake.
Both the Sierra EV and the R1T have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, around view monitors, rear cross-path warning and driver alert monitors.
The GMC Sierra EV weighs 1924 pounds more than the Rivian R1T. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.