In the pre-dawn hours along the Overseas Highway in the Florida Keys, the world is bathed in the ethereal glow of the blue hour. Here's a poetic description of this tranquil and enchanting scene:

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**1. Indigo Skies:**
As night relinquishes its hold, the skies above the Overseas Highway transition into a mesmerizing indigo canvas. The fading stars twinkle reluctantly, making way for the impending dawn.

**2. Silhouettes on the Horizon:**
The highway and its surrounding islands are mere silhouettes against the deep blue backdrop. Palm trees and the outlines of bridges stand as stoic sentinels, waiting for the first light to grace the landscape.

**3. Still Waters Reflecting Twilight:**
The waters on either side of the highway mirror the calmness of the pre-dawn hour. They become a reflective surface, capturing the delicate hues of the twilight sky and blending seamlessly with the asphalt ribbon that stretches into the distance.

**4. Subtle Glow on the Horizon:**
On the eastern horizon, a subtle glow emerges, a harbinger of the approaching sunrise. The blue hour weaves its magic, creating a seamless transition between night and day.

**5. Coastal Sounds in Hushed Tones:**
The sounds of the coast are subdued during the blue hour. Gentle waves caress the shore, and the occasional call of a seabird adds a hushed melody to the tranquil scene.

**6. Dimly Lit Fishing Piers:**
Fishing piers along the highway are dimly lit, their lamplights casting a soft glow on the surroundings. Anglers prepare their gear, and the promise of a new day's catch hangs in the salt-tinged air.

**7. Muted Tones of the Landscape:**
The landscape, still draped in shadows, takes on muted tones. Vegetation along the highway, including swaying palms and tropical flora, is veiled in a gentle obscurity, creating an air of mystery.

**8. Empty Road Awaiting Awakening:**
The Overseas Highway, devoid of the daytime hustle, stretches ahead like a slumbering serpent. Its empty lanes anticipate the awakening of travelers and the rhythmic hum of tires on asphalt.

**9. Pre-Dawn Fishing Boats at Anchor:**
Fishing boats at anchor in quiet harbors gently rock with the tide. Their hulls become spectral forms in the pre-dawn light, waiting for the first rays of sunlight to dance on the water.

**10. Transition to Golden Hour:**
As the blue hour unfolds, a subtle transformation begins. The indigo tones yield to hints of amber and gold on the horizon, signaling the imminent arrival of the sun. The world, for a fleeting moment, exists in a delicate balance between night and day.

In the pre-dawn blue hour along the Overseas Highway, nature orchestrates a symphony of muted colors and subdued sounds, offering a tranquil and introspective interlude before the vibrant crescendo of the sunrise.