A more thorough explanation:

Definition: Extrahazardous is an adjective used to describe something that is exceptionally or unusually dangerous. This term is often used to refer to dangerous railroad crossings.

Example: The railroad crossing near the school is considered extrahazardous because it has poor visibility and no warning signals.

Explanation: The example illustrates how the term extrahazardous is used to describe a dangerous situation. The railroad crossing near the school is considered extrahazardous because it poses a significant risk to the safety of drivers and pedestrians. The lack of warning signals and poor visibility make it especially dangerous.