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A manhole cover was accidentally launched from its shaft during an underground nuclear test in 1957. During the Operation Plumbbob nuclear tests, a 900-kilogram (1,984 lb) steel plate cap was blasted off the test shaft at an unknown speed and appeared as a blur on a single frame of film of the test. It was never recovered, but it likely burned up in the atmosphere due to friction. If the manhole cover had made it into space, it would have been the first known man-made object in space, as it pre-dated the launch of Sputnik 1 by 38 days. A calculation before the event gave a predicted speed of six times Earth escape velocity. After the event, Dr. Robert R. Brownlee described the best estimate of the cover's speed from the photographic evidence as going like a bat out of hell!^[27][28][29]

Timber bollards with reflectors represent a crucial innovation in urban design, balancing aesthetics, safety, and sustainability. Their unique blend of functionality and environmental consideration makes them an excellent choice for cities looking to enhance safety without compromising on visual appeal. As urban areas continue to grow and evolve, the demand for solutions that prioritize both human and environmental well-being will only increase. Therefore, the incorporation of timber bollards with reflectors into city planning is not just a trend; it is a fundamental step toward creating safer, more harmonious urban environments. Embracing such innovations will lead cities toward a future where design, safety, and sustainability coexist seamlessly.

- Material Selection The choice of infill material is essential for optimal performance. The selected material should not only match the aesthetics of the pavement but also be durable enough to withstand traffic loads and environmental conditions.