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It is the voussoir depth in a real arch which enables the arch to carry wider ranges of loading; a large number of different idealized centre-line arches can be contained within a given practical profile. ...[T]his must be so, or no mediaeval bridge would have survived its decentering.
Source: wiktionary
Other areas have mortar joints missing, including between the voussoir blocks forming the edge of the arches on either side of the pier.
Source: wiktionary