The phrase "a broad boulevard" is correct and usable in written English.
You can use it to describe a wide street, typically one that is lined with trees or buildings, often found in urban areas.
Example: "The city is known for its beautiful parks and a broad boulevard that runs through the center, making it a popular spot for both locals and tourists."
Alternatives: "a wide avenue" or "a spacious street".
Décor is minimal but warm and the outside tables on a broad boulevard are roomy.
As we turned onto a broad boulevard, he gestured at the buildings on either side.
St . Petersburgs central thoroughfare, Nevsky is a broad boulevard lined with department stores, boutiques, cafes, restaurants, office buildings and palaces.
We drove out of the campus on Farooqui's scooter and took a left on a broad boulevard.
The Ku'damm is a broad boulevard of wide sidewalks and pricey shops, Berlin's answer to Madison Avenue.
A broad boulevard that was sliced through the camp had been jaggedly paved with the remnants of smashed buildings.
Office buildings and service plazas line either side of the broad boulevard, save for a stretch taken up by fields of shade tobacco, a crop used for cigar wrappers.
Then you turn a corner of a narrow street to find yourself in a broad, leafy boulevard of elegant French colonial villas.
But after the tracks were covered and the cinder-belching locomotives converted to electricity, people began to notice that it was a broad, sunny boulevard, immediately adjacent to the gold coast of Fifth and Madison Avenues.
In a county where slaves toiled in cotton and tobacco plantations barely a century earlier, the planners envisioned a broad Soul City boulevard leading south into the development from nearby Interstate 85.
Pelham - THIS town has a perfect stretch for longboarding, and Ben Kamlet, enthusiast-cum-salesman, knows it well: the two-mile stretch of the Esplanade, a broad residential boulevard with a landscaped median and slow traffic.
