BYD’s appropriately named Adaptive Cruise Control’ accurately portrays system functionality. The promotional material and the handbook correctly indicate the limitations of the system capabilities. System status information is displayed but there is no headup display. Sensing that the driver’s hands remain on the steering wheel was not robust, and the car lost points in this area, and for driver monitoring more generally. However, the system balances driver steering input with lane guidance, promoting co-operative driving.

The ATTO 3 uses camera inputs to detect speed limit signs. However, the speed limiter reacted to some temporary and/or conditional speed limits as though they were primary limits, and did not meet Euro NCAP’s requirements. There is no speed adaptation for upcoming road features such as curves and junctions. The ATTO 3 responds to avoid a collision in some of the ACC test scenarios. The driver is supported through the S-Bend, but the car is kept fully in lane only at the lowest test speed. A lane-change assist function is not provided. In case of an unresponsive driver, the ATTO 3 disengages the lane centering function but keeps the adaptive cruise control active. If the radar or camera is blocked the car provides a warning but does not disengage.

The BYD ATTO 3 provides modest levels of driver engagement and vehicle assistance. However, it is in the area of safety backup and, specifically, the lack of action which is taken in case of an unresponsive driver, that the car performs poorly. Overall, the system is Not Recommended for highway assistance.