Learn Italian: Questo incrocio è sempre bloccato. - This intersection is always blocked.

It is a past participle acting as an adjective. It comes from the verb bloccare (to block), but here it describes the state of the intersection. Because it describes the masculine singular noun incrocio, it must end in -o.

How is the word incrocio pronounced?

It is pronounced "in-CRO-cho." The c before the i makes a soft "ch" sound like in "cheese", and the i itself is completely silent. It only exists to soften the c.

How would I use this lesson's grammar to add "It takes an hour to cross it"?

Because a blocked intersection causes delays, this is a perfect place to use volerci and metterci. To say "It takes an hour" (in general, for anyone), you would use the impersonal volerci and say Ci vuole un'ora. If you wanted to say "I take an hour," you would use the personal metterci and say Ci metto un'ora.