2013 Toyota Sienna Owners Manual - Page 651

2-4. Using other driving systems 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 Speed 18 mph (28 km/h) 5 mph (8 km/h) Approximate alert distance 65 ft. (20 m) 18 ft (5.5 m) 350 SIENNA_OM_OM45472U_(U)