§ 224. Bridges. Neither in the improvement, repair or reconstruction of town highways, nor in the surfacing thereof, pursuant to this article, shall the continuity of the roadbed be interrupted by bridge structures which are not at least four feet wider than such roadbed, but not less than twenty-four feet, provided, that the county superintendent and the commissioner may permit deviations below such minimum standards in planning or during the course of completion of the work, if, in their opinion, the particular circumstances make such deviation advisable. Bridges built or retained on qualifying roads shall meet minimum standards established by the commissioner.