Respuesta :
Reckless is the gerund and it is being used as an subject of this sentence (which would mean it is a noun).
Answer:
- Gerund: Driving.
- Use: Subject.
Explanation:
The gerund would be: driving.
Whereas the use would be: subject.
The adjective reckless modifies the verb driving turning the phrase into a noun, reckless driving, whose main function is as a subject for the rest of the sentence.
Another example would be: creative filmmaking is not common nowadays.