Toyota Prius: LCA (Lane Change Assist)

• LCA functions
• Operating the LCA

LCA functions

This function is linked to the LTA and provides assistance in performing lane changes through steering wheel operations.

Use the this function only on highways and expressways.

The steering assist operation can be overridden by the steering wheel operation of the driver.

The lane change assist function is not designed to operate when changing lanes at a junction.

WARNING

Before using the LCA system

• Do not overly rely on the LCA system.

The LCA system is not a system which provides automated assistance in driving and it is not a system which reduces the need for checking an adjacent lane for other vehicles, approaching vehicles, etc. when changing lanes.

Also, do not use the LCA to change lanes into which a lane change should not be performed (oncoming lanes, road shoulders, etc.).

• Failure to perform appropriate driving operations and pay careful attention may lead to an accident.

Operating conditions of function

This function is operable when all of the following conditions are met:

• The LTA is operating.
• The lane change assist function is enabled by a customize setting.
• The vehicle speed is between approximately 55 and 85 mph (90 and 140 km/h).
• The system detects a broken white line on the side which the lane change is to be performed.
• A vehicle is not detected in the lane toward which the turn signal is operated.
• The steering wheel is not being turned with a large force.
• The hands off steering wheel warning   is not operating.

Cancelation of functions

In the following situations, operation of the LCA may be canceled with the display and buzzer:

• When the operating conditions  are no longer met
• When the system can no longer detect lane lines
• When the turn signal lever is operated to the second position
• When the turn signal lever is operated in the opposite direction of the lane change
• When the system detects operation of the steering wheel, brake pedal or accelerator pedal by the driver

In the 2024 Toyota Prius, the safety system is designed to alert the driver and assist in maintaining safe lane positioning when there is a rapidly approaching vehicle in the adjacent lane. When the turn signal is activated and the system detects a fast-approaching vehicle in the intended lane, a buzzer will sound, and a visual warning message will appear on the multi-information display to alert the driver. Additionally, the system may provide slight steering inputs to help keep the Prius away from the approaching vehicle, enhancing the driver's control and overall safety. This feature is part of Toyota's advanced driver assistance systems, aimed at reducing the risk of collision during lane changes.

Operating the LCA

If the turn signal lever is held in the first position, the lane change direction will be displayed and the function will operate.

To change lanes by holding the turn signal lever in the first position without using the LCA, turn the customize setting of the LCA off.

1. First position: LCA is operational
2. Second position: LCA is not operational

WARNING

Situations in which the LCA should not be used

• When driving on a one lane road
• When there is no broken white line between the current lane and the lane to be changed to

Enabling/disabling the system

LCA can be enabled/disabled through a customize setting

Displays and system operation

The operating state of the LCA system is indicated.

LTA (Lane Tracing Assist)LDA (Lane Departure Alert)