"Joseph Michael Callahan" is an United States/American former professional ice hockey defenceman who played in the National Hockey League. Callahan was born in Brockton, Massachusetts, but grew up in Abington, Massachusetts.

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These are mechanisms that prevent lateral movement of the bridge. They lock together and provide stability.

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The pins allow rotation of the bridge at the bearing areas. The need for rotation is mainly derived from the fact that steel expands and contracts with temperature variations. When the temperature warms, the bridge naturally expands, or lengthens longitudinally, and unless it's allowed to do so, undesired stresses are introduced to the structure.

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The outlook for a career in transportation is excellent.

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