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Bollards are short vertical posts erected to create a physical barrier or to delineate boundaries. They serve multiple purposes, such as preventing vehicle access to certain areas, protecting pedestrians from traffic, and enhancing the visual appeal of a space. While traditionally made from materials like metal, concrete, or plastic, modern designs allow for greater creativity and functionality, adapting to diverse urban needs.

- Cast Iron Known for its durability and strength, cast iron drain covers are capable of withstanding heavy loads, making them ideal for roads and parking lots. They have a long lifespan and are resistant to rust when properly coated.

Design Considerations

Aesthetic Value

However, the main purpose of manhole cover why it is preferable to make it in round shape is to prevent it from falling into the circular opening. All manholes, whether it's a sewer or not, it will be created with a lip around the rim of the hole, with a size small enough than the manhole cover dimensions. Unlike if it is in rectangular, square, or oval shape, even if the hole is smaller and the cover is a bit larger, once the manhole cover will be inserted into the hole diagonally then there is a possibility that it could fit in and fall. With the circular shape, inserting diagonally still won't work to fit it and slip into the hole which make it more safe.