Question: It is so crowded with humanity, on foot and on assorted wheels, and is crammed with so many fascinating things for sale, that one risks overlooking the significant monuments along the way.
There are so many things happening, that you may no notice the sights.

Answer: it is not possible to tell

Question: The other, smaller, had a bandoleer of small flintlock pistols running across his chest with two more on each hip.
He was unarmed.

Answer: no

Question: The elegant (and today traffic-choked) Gran Va, Madrid's central shopping artery, is a turn-of-the century showcase of Art Nouveau and Art Deco styles.
There is a lot of traffic in Gran Va

Answer:
yes