Lexus LS 600h L 2012 Owner's Manual page 291

2-4. Using other driving systems
● If there is a slope in the road
The assisted parking position will move left or right of the set target
parking position.
In this case, if you align the warning flag with the rear of the forward
parked vehicle, and the extended green line with the lower edge of the
parked vehicle's rear wheel when setting the target parking position,
the left side of your vehicle will be roughly in line with the left side of the
front parked vehicle once assisted parking is complete. If you are par-
allel parking on the opposite side of the road, left and right will be
reversed.
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