By the 1920s a uniform highway numbering system, with standardized road signs, identified the National Road and U.S. Black Vinyl Grip w/Yellow Top Marker 3 Silver Anodized Aluminum Spokes Thick Textured. Grant 633 Performance GT Series Steering Wheel 13 in. Eighty-three existing milestones have been documented with the greatest number in the eastern counties. These 'Suede Series' steering wheels offer each driver premium suede wrapped wheel, hand stitched custom yellow center line with red custom stitching, and a 13.75' contoured grip for the ultimate comfort. Later, concrete was used to replace some of the sandstone markers. These concrete markers weathered poorly and many were replaced with sandstone markers in the 1850s. The earliest milestones were fabricated of a reinforced cementitious material in the 1830s. Each stone indicated the distance to Cumberland, Maryland, (where the Road began), at the top center, and the name of and mileage to the nearest city or village for east and westbound travelers. The five-foot tall markers were set directly into the ground with about three feet exposed. In Ohio, the markers were square with curved heads. However, since the act included no specifications, the design and construction material of the milestones varied. In accordance with this stipulation, milestones were set at one-mile intervals along the north side of the Road. The Act of Congress authorizing the National Road required distinguishable marks or monuments to appear at regular intervals along the Road.
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