What is the name of the red rope pulled before the expressway starts?

Some look high, others look low to the naked eye. This is actually the height of this earthwork layer. When pulling soil and rolling, the foreman directs the vehicle to pour enough soil to reach this height. Then the loader or bulldozer carries out leveling and rolling.

If the expressway is strictly in accordance with the requirements, the earthwork will be rolled every 30 cm or so. If it is too thick, it will be dishonest. Telephone charges and working hours are too little.

But in practice, for the sake of efficiency and convenience, many earthwork layers of 50 cm or even 1 m and 1 m are placed directly.

The next step of road construction is earthwork layer, macadam layer, base (upper and lower base) surface layer (upper and lower layers).