NISSAN 2011 Altima - Manual (Page 181)

They are indicated as reference distances to
objects. The lines and colors in the display indi-
cate distances from the back bumper line
᭺
A in
the illustration.
᭺
1 1.5 ft (0.5 m) red
᭺
2 3 ft (1 m) yellow
᭺
3 7 ft (2 m) green
᭺
4 10 ft (3 m) green
The vehicle clearance lines are wider than
the actual clearance.
DIFFERENCE BETWEEN
PREDICTED AND ACTUAL
DISTANCES
The distance guide line and the vehicle width
guide line should be used as a reference only
when the vehicle is on a level, paved surface. The
distance viewed on the monitor is for reference
only and may be different than the actual distance
between the vehicle and displayed objects.
LHA0437
WHA1504
4-14 Monitor, climate, audio, phone and voice recognition systems