What is the operational limitation when the SPNSN NOT LEVEL light is illuminated?

When the SPNSN NOT LEVEL light is illuminated, it indicates a malfunction in the system that affects the vehicle's stability and control. In this situation, the operational limitation is a maximum speed of 18 mph, which is designated to ensure the safety of the vehicle and its occupants. At this reduced speed, the vehicle can maintain manageable control while the driver addresses the underlying issue related to the sensor. This limitation serves as a precautionary measure to prevent potential accidents or further damage to the vehicle until the problem can be rectified.

The other choices represent higher maximum speeds that would not be safe under the indication of the SPNSN NOT LEVEL light, as operating at those speeds could increase the risk of losing control due to the compromised stability that the light signals.