See also:

How TSA works
Once swaying has begun, it can be very difficult to stop, which makes it difficult to control the vehicle and trailer. The TSA system continuously monitors the vehicle's movements, particularly ...

Accessory installation
• We strongly recommend that Volvo owners install only genuine, Volvo-approved accessories, and that accessory installations be performed only by a trained and qualified Volvo service technician. ...

Limitations
Strong sunlight, reflections, extreme light contrasts, the use of sunglasses, or if the driver is not looking straight ahead may make the visual warning signal in the windshield difficult to see. ...