Toyota Prius: RSA (Road Sign Assist)

The RSA system detects specific road signs using the front camera and/or navigation system (when speed limit information is available) and warns the driver via displays and buzzers.

WARNING

For safe use

• Driving safely is solely the responsibility of the driver. Pay careful attention to the surrounding conditions in order to ensure safe driving.
• Do not rely solely upon the RSA. The RSA assists the driver by providing road sign information, but it is not a replacement for the driver's own vision and awareness. Driving safely is solely the responsibility of the driver. Pay careful attention to the surrounding conditions in order to ensure safe driving.

Situations in which the RSA should not be used

When it is necessary to disable the system

Situations in which the system may not operate properly

• Situations in which the sensors may not operate properly

Display Function

• When the front camera detects a sign or information of a sign is available from the navigation system, the sign will be displayed on the display.
• Multiple signs can be displayed.

Depending on the specifications of the vehicle, the number of displayed signs may be limited.

Operating conditions of sign display

Signs will be displayed when the following conditions are met:

• The system has detected a sign In the following situations, a displayed sign may stop being displayed:

• When a new sign has not been detected for a certain distance
• When the system determines that the road being driven on has changed, such as after a left or right turn

Situations in which the display function may not operate properly

In the following situations, the RSA system may not operate properly and may not detect signs or may display the incorrect sign. However, this does not indicate a malfunction.

• When a sign is dirty, faded, tilted or bent
• When the contrast of an electronic sign is low
• When all or part of a sign is hidden by a tree, utility pole, etc.
• When a sign is detected by the front camera for a short amount of time
• When the driving state (turning, changing lanes, etc.) is judged incorrectly
• When a sign is immediately after a freeway junction or in an adjacent lane just before merging
• When stickers are attached to the rear of a preceding vehicle
• When a sign similar to a system compatible sign is detected as a system compatible sign
• When a speed limit sign for a frontage road is within detection range of the front camera
• When driving around a roundabout
• When a sign intended for trucks, etc. is detected
• When the navigation system map data is out of date
• When the navigation system cannot be used

In this case, the speed limit signs displayed on the multi-information display and navigation system display may differ.

Notification function

In the following situations, the RSA system will output a warning to notify the driver.

• If the vehicle speed exceeds the speed warning threshold of the speed limit sign displayed on the display, the sign display will be emphasized and a buzzer will sound.
• When the RSA system detects a do not enter sign and determines that the vehicle has entered a no-entry area, the do not enter sign displayed on the display will flash and a buzzer will sound.

Operating conditions of the notification functions

• Excess speed notification function

This function will operate when the following condition is met:

• A speed limit road sign is recognized by the system.

• No entry notification function

This function will operate when all of the following conditions are met:

• More than one no entry road signs are recognized by the system simultaneously.
• The vehicle is passing between no entry road signs recognized by the system.

Types of road signs supported

• The following types of road signs can be displayed.

However, non-standard or recently introduced traffic signs may not be displayed.

Speed limit

Do Not Enter

No U-turn

No Turn On Red

Stop

Yield

Warning

• Depending on the specifications of the vehicle, signs may be displayed overlapping.

Changing RSA settings

• The following settings of the RSA can be changed through customize settings.