Concrete Arrows Across the U.S. The U.S. landscape is still dotted with enormous concrete arrows that guided early airmail pilots across the country.

Two large concrete arrows sit atop Acalanes Ridge in Walnut Creek, Calif., photographed on Wednesday, Dec. 23, 2015. The arrows are part of a network of about 1,500 arrows, of slightly different ...

The concrete arrows were placed about every 10 miles between the stops, generally in remote areas often hard to get to. The Steamboat Ditch arrow fits that description.

Crews are making gradual progress on concrete construction in some areas of Security-Widefield in advance of repaving later ...

Photos of the concrete barriers along the makai (ocean-facing) edge of Honoapiʻilani Highway show the ground beneath them has ...

Driving around the Pikes Peak region this summer, it's easy to find crews performing concrete work to prepare for repaving ...

Since entropy always goes up, and time always moves forward, there might be a connection there. It is, after all, the only serious place in physics where a concrete “arrow of time” appears. But ...

Texas Country Reporter The Story Behind a 70-Foot Concrete Arrow Near Odessa A hundred years ago, U.S. airmail pilots depended on a coast-to-coast bread-crumb trail of arrows—though most have ...

• Arrow-Master screeds feature the true single-operator, self-propelled drive • Lightweight aluminum "A" frame construction • Handles slump in excess of three inches ...