1. The road is closed for construction.
(What is the active voice sentence of #1?)
2. The city has closed the road for construction.
3. The city closes the road for construction.
I'd say #2 is the active version of #1.
The active voice sentence of #1 is:
"The city has closed the road for construction."
To identify the active voice sentence, we need to determine the subject performing the action. In this case, the subject is "the city," and it is performing the action of closing the road. The sentence structure is in the present perfect tense, indicating an action that has been completed in the past with ongoing relevance to the present.