Lexus IS300H 2017 Manual page 345

RCTA function detection areas
The areas that vehicles can be detected in are outlined below.
The buzzer can alert the driver of faster vehicles approaching from farther away.
Example:
Approaching vehicle
Fast
Slow
The RCTA function is operational when
■
The RCTA function operates when all of the following conditions are met:
The BSM function is on.
●
The shift lever is in R.
●
The vehicle speed is less than approximately 8 km/h (5 mph).
●
The approaching vehicle speed is between approximately 8 km/h (5 mph) and 28 km/h
●
(18 mph).
4-5. Using the driving support systems
Speed
28 km/h (18 mph)
8 km/h (5 mph)
345
Approximate
1
alert distance
20 m (65 ft.)
5.5 m (18 ft.)
4