Lexus LS600hL Owner's Manual page 343

The Rear Cross Traffic Alert function detection areas
The areas that vehicles can be detected in are outlined below.
To give the driver a more consistent time to react, the buzzer can alert for
faster vehicles from farther away.
Example:
Approaching vehicle
Fast
Slow
The Rear Cross Traffic Alert function is operational when
■
The BSM main switch is set to on.
●
The shift lever is in R.
●
Vehicle speed is less than approximately 5 mph (8 km/h).
●
Approaching vehicle speed is between approximately 5 mph (8 km/h) and 18 mph
●
(28 km/h).
LS600hL_U(OM50D26U)
4-5. Using the driving support systems
Speed
18 mph (28 km/h)
5 mph (8 km/h)
343
Approximate
1
alert distance
65 ft. (20 m)
18 ft. (5.5 m)
4