The passenger compartment of the SEAL-U remained stable in the frontal offset test. Dummy numbers showed good protection of the knees and femurs of both the driver and passenger. BYD showed that a similar level of protection would be provided to occupants of different sizes and to those sitting in different positions.  Protection of the front seat passenger was good for all critical body areas.  Analysis of the deceleration of the impact trolley during the test, and analysis of the deformable barrier after the test, revealed that the SEAL-U would be a moderately benign impact partner in a frontal collision. In the full-width rigid barrier test, protection of all critical body areas was good or adequate for the driver and good for all body areas of the rear passenger. In both the side barrier test and the more severe side pole impact, protection of all critical body areas was good and the SEAL-U scored maximum points in this part of the assessment.  Control of excursion (the extent to which a body is thrown to the other side of the vehicle when it is hit from the far side) was adequate. The SEAL-U has a counter-measure to mitigate against occupant to occupant injuries in such impacts and this performed well in the side pole impact. Tests on the front seats and head restraints demonstrated good protection against whiplash injuries in the event of a rear-end collision.  A geometric analysis of the rear seats indicated marginal whiplash protection.   The SEAL-U has an advanced eCall system which alerts the emergency services in the event of a crash.   The car also has a system which applies the brakes after an impact, to avoid secondary collisions.  BYD demonstrated that if the car entered water the doors, if locked, could be opened within two minutes of power being lost and a hammer is provided to allow side windows to be broken to allow escape.

In both the frontal offset and side barrier tests, good protection was provided to all critical body areas for both child dummies apart from the neck of the 10 year child, protection of which was adequate.  The front passenger airbag can be disabled to allow a rearward-facing child restraint to be used in that seating position.  Clear information is provided to the driver regarding the status of the airbag and the system was rewarded.  The SEAL-Uis equipped with a direct 'child presence detection' system, which issues a warning when it detects that a child or infant has been left in the car.  However, the system did not meet Euro NCAP's requirements and was not rewarded. All of the child restraint types for which the SEAL-U is designed could be properly installed and accommodated in the car.

Protection of the head of a struck pedestrian or cyclist was predominantly good or adequate, with poor results recorded at the base of the windscreen and on the stiff windscreen pillars.  Protection of the pelvis was predominantly good while that of the femur and the knee and tibia was at good at all test locations.  The autonomous emergency braking (AEB) system of the BYD can respond to vulnerable road users as well as to other vehicles.  The system performed well in tests of its response to pedestrians. The system also scored highly in tests of its reaction to cyclists, but not for dooring, in which the car prevents or warns against door opening if a cyclist is approaching from behind.  The AEB system performed well in all tests of its response to motorcyclists and scored full points.

Overall, the autonomous emergency braking (AEB) system of the BYD SEAL-U performed well in tests of its reaction to other vehicles, but did not score for the head-on scenarios.  A seatbelt reminder system is fitted as standard to the front and rear seats and the car scored some points for driver status monitoring.  The lane support system gently corrects the vehicle’s path if it is drifting out of lane and also intervenes in some more critical situations.  The speed assistance system identifies the local speed limit, and the driver can choose to allow the limiter to be set automatically by the system.