Lexus GS 350, Owner'S Manual, Page: 259 / 831

GS350_U (OM30C34U)
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4-5. Using the driving support systems
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Dr
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Vehicle width extension guide lines
Visually check the surroundings and the area behind the vehicle. In the
case shown below, the truck appears to be outside of the vehicle width
extension guide lines and the vehicle does not look as if it hits the truck.
However, the rear body of the truck may actually cross over the vehicle
width extension guide lines. In reality if you back up as guided by the
vehicle width extension guide lines, the vehicle may hit the truck.
Vehicle width extension guide lines