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Explanation: Sometimes I feel a bit squeamish about those virtually 'literal' translations but it really is a question of understanding what the original source text is actually referring to:
In September of 2004 a hay truck traveling at high speeds struck the bridge, badly damaging several elements of the north truss. Damage was also done to the railing and timber >>> wheel guards <<<. The damage was severe enough to reduce the capacity of the bridge to carry heavy truck traffic.
This is the part of the bridge that support the structure and helps prevent vehicles from FALLING INTO THE RIVER or having other similar misadventures ;)