Final answer:
The phrase 'wildly across the road' functions as an adverbial phrase, modifying a verb by describing how an action is performed, indicating movement across the road in an uncontrolled manner.
Step-by-step explanation:
The phrase 'wildly across the road' likely functions as an adverbial phrase in a sentence. An adverbial phrase is a group of words that acts as an adverb, providing more details about the verb by describing how, when, where, or to what extent some action is performed. In this case, 'wildly' is an adverb modifying the prepositional phrase 'across the road', which together describe how an action is being performed, most likely indicating that someone or something is moving across the road in an uncontrolled or excited manner.