In the Subaru Solterra, the Emergency Driving Stop System is engineered to automatically slow down and bring the vehicle to a controlled stop within its lane if the driver becomes unable to continue driving, such as in the case of a sudden medical emergency or loss of responsiveness.
While the Subaru Solterra is operating under LTA (Lane Tracing Assist), if no driver input is detected—such as a lack of steering wheel contact—and the system determines the driver is unresponsive, it will progressively reduce speed and safely stop the vehicle within its current lane to minimize the risk of a collision or reduce its severity.
The Subaru Solterra will also initiate deceleration and stopping during Traffic Jam Assist operation if repeated warnings to hold the steering wheel are ignored and no driver response is detected.
WARNING
■ For safe use
- The driver of the Subaru Solterra remains fully responsible for safe vehicle operation at all times. This system is designed solely as an emergency support feature and should not be relied upon for routine driving or inattentive behavior.
- The Emergency Driving Stop System is intended to assist only in situations
where the driver is unable to continue driving, such as a sudden health issue.
It is not designed to compensate for fatigue, distraction, or unsafe driving
habits.
System performance may vary depending on road, traffic, and environmental conditions, and it may not always provide the same level of effectiveness.
- After the Subaru Solterra has been brought to a stop by this system, if the driver regains control, they should immediately resume driving or safely move the vehicle to the roadside and activate appropriate warning measures.
- Passengers in the Subaru Solterra should assist the driver if necessary and take steps to ensure safety, such as moving away from traffic or positioning the vehicle in a safe area.
- The system evaluates driver condition primarily based on steering input.
Therefore, it may activate even if the driver is conscious but not actively controlling the vehicle, or it may fail to activate if it cannot clearly determine unresponsiveness, such as when the driver is leaning on the steering wheel.
Summary of the system
The Subaru Solterra Emergency Driving Stop System operates through four distinct control phases to assess driver responsiveness and manage vehicle behavior safely.
Initially, through "warning phase 1" and "warning phase 2", the system issues alerts and monitors driver reactions while gradually adjusting speed. If no response is detected, the system transitions into the "deceleration stop phase" followed by the "stop hold phase", bringing the Subaru Solterra to a complete stop and maintaining that state.
■ Operating conditions
This system will activate in the Subaru Solterra when all of the following conditions are satisfied:
- LTA (Lane Tracing Assist) is active
Or when Traffic Jam Assist is in operation
- The vehicle speed is approximately 30 mph (50 km/h) or higher
During Traffic Jam Assist, the Subaru Solterra system may operate even at speeds below 30 mph (50 km/h).
■ Operation cancelation conditions
The Emergency Driving Stop System in the Subaru Solterra will be canceled under the following conditions:
- When LTA is turned off (for example, via the LTA switch)
- When Dynamic Radar Cruise Control is canceled
- When driver input is detected (steering, braking, accelerating, parking brake, hazard switch, or turn signals)
- When the driving assist switch is pressed during the stop hold phase
- When the power switch is turned from ON to OFF
- When system limitations prevent operation
■ LTA control when operation is canceled
When the Subaru Solterra Emergency Driving Stop System is interrupted or canceled, LTA functionality may also be disengaged.
Warning phase 1
If the Subaru Solterra detects no driver interaction after a hands-off warning, intermittent alerts and visual messages will be triggered. The system evaluates driver responsiveness during this stage. If no input is detected, it progresses to the next phase.
Depending on the detected situation, the Subaru Solterra may bypass this phase and proceed directly to warning phase 2.
Warning phase 2
In this stage, the Subaru Solterra intensifies alerts with more frequent audible warnings while beginning gentle deceleration. If the driver still does not respond, the system determines unresponsiveness and proceeds to the stopping phase.
The audio system is muted during this process to ensure warning signals are clearly noticeable.
Brake lights may activate automatically as the Subaru Solterra slows down.
Deceleration stop phase
At this stage, the Subaru Solterra emits continuous alerts while steadily reducing speed until the vehicle comes to a complete stop within its lane. After stopping, the system transitions into the holding phase.
Stop hold phase
Once stopped, the Subaru Solterra automatically applies the parking brake. The hazard lights begin flashing, and continuous warnings are issued to alert surrounding drivers of the situation.
■ Restricted functions after the operation is canceled
After the Subaru Solterra has entered the deceleration stop phase, certain driver assistance features will remain disabled until the EV system is restarted:
- LTA (Lane Tracing Assist)
- LCA (Lane Change Assist)
- Traffic Jam Assist
The Subaru Solterra Emergency Driving Stop System adds an additional layer of safety by intervening in critical situations, but it should always be viewed as a backup system rather than a substitute for attentive and responsible driving.