Minnesota Blue Card Practice Test

The correct choice identifies that water depths of around 6 inches can potentially cause loss of control or stalling in most passenger cars. At this depth, vehicles may experience hydroplaning, where the tires lose contact with the road due to water accumulation beneath them, which can significantly reduce traction and steering capability. Additionally, water that deep can enter the vehicle's engine air intake, potentially leading to stalling because the engine may ingest water instead of air necessary for combustion. When considering the context of flooding conditions or driving through standing water, the threshold for concern often starts around this depth, as it presents a balance where many cars, depending on their build, can begin to experience these hazardous conditions. Shallower depths like 4 or 5 inches may pose a lesser risk, whereas deeper levels like 7 inches further increase the likelihood of severe vehicle impairment. Thus, 6 inches serves as a practical warning threshold for drivers to recognize when water becomes a significant hazard.