What part of speech is limit in The speed on this stretch 40 miles per hour?

In the sentence "The speed on this stretch is limited to 40 miles per hour", "limit" is a verb.

Here's why:

* The sentence describes an action: The speed is being limited.

* "Limit" is used in the past participle form: "limited" This is a common way verbs are used in passive voice sentences.

Let me know if you'd like to explore other parts of speech!