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Did you know that when a racing bollide moves along the track, the distance between its bottom and asphalt is so small that it forms a low pressure? Because of this, race cars, driving hatches on the road surface, lift the manhole covers, which can subsequently cause an accident or fire of a bolide moving behind. It happened in 1990 in Montreal. Since then, all manhole covers have been tightly welded to avoid the dire consequences of that year.
