| 摘要 |
PURPOSE: All road indication lines of permanent concrete structure are provided to promote safety and convenience and to reduce expenses by using a road indication line permanently. CONSTITUTION: The road indication lines of permanent concrete structure is constituted by the steps of cutting grooves to be equal to the shape of a traffic lane or all indication lines, letters and signs from the surface of an asphalt roadway to the lower part, mixing water, sand, pebbles, luminous agents and paint in white, yellow and blue, then concreting in the grooves.
|
