The passenger compartment of the NX remained stable in the frontal offset test. Dummy numbers showed good protection of the knees and femurs of both the driver and passenger. Lexus showed that a similar level of protection would be provided to occupants of different sizes and to those sitting in different positions. Apart from the driver’s chest, protection of which was rated as marginal, based on readings of chest compression, all body critical body areas of both front row dummies were well protected.  Analysis of the deceleration of the impact trolley during the test, and analysis of the deformable barrier after the test, revealed that the NX would be a moderately benign impact partner in a frontal collision. In the full-width rigid barrier test, good or adequate protection was provided to all critical body areas for both the driver and rear passenger. In the side barrier test, protection of all critical body areas was good and the car scored maximum points in this part of the assessment. In the more severe side pole impact, protection of the chest was adequate and that of other parts of the body was good. 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 found to be adequate. The NX has a countermeasure to mitigate against occupant-to-occupant injuries in such impacts and, while this performed well in Euro NCAP's test, Lexus did not provide additional information to demonstrate that the performance was robust and symmetrical. 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 also indicated good whiplash protection.   The NX 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.

In the frontal offset test, protection of the neck of the 10-year dummy was adequate.  Otherwise, protection of both child dummies was good in both the frontal offset and the side barrier impact.  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.  All of the restraints for which the NX is designed could be properly installed and accommodated in the car.

The protection provided by the bonnet to the head of a struck pedestrian was predominantly good or adequate.  Protection of the pelvis and leg areas was good at all test locations and the NX scored maximum points for these parts of the assessment.  The autonomous emergency braking (AEB) system fitted as standard to the NX can detect vulnerable road users as well as other vehicles.  In tests of its response to both pedestrians and cyclists, the system performed well, with collisions avoided or mitigated in most scenarios.

The autonomous emergency braking system performed well in tests of its response to other vehicles, with collisions avoided in nearly all cases, and mitigated in others.  A lane support system gently steers corrects the vehicle’s path if it is drifting out of lane and can also intervene in some more critical situations to avoid road departure.  The speed assistance system detects the local speed limit and the driver can opt to allow the speed limiter to react as appropriate.  A seat belt reminder is standard for all seating positions.