When is it illegal to leave a child under six years of age unattended in a vehicle?

Leaving a child under six years of age unattended in a vehicle is particularly illegal when the keys are in the ignition. This situation poses a significant risk because it increases the potential for a child to accidentally start the vehicle, leading to dangerous scenarios. Children are often curious and may not understand the dangers of manipulating vehicle controls. Therefore, laws are designed to protect young children from these risks, emphasizing the importance of keeping them safe.

The other scenarios mentioned, such as rain or high temperatures, while they raise concerns about the child's safety, do not have the same immediate danger associated with leaving the keys in the ignition. Thus, it’s crucial to understand that the presence of the keys significantly elevates the risks, influencing the legality of leaving a child unattended in that circumstance.