§ 249. Investigation by the department of transportation. The
department of transportation shall upon the receipt of such resolution
or concurrent resolution, investigate and determine whether the bridge
so sought to be abolished is of sufficient public importance to come
within the provisions of this article, taking into account the use,
location and value of such toll bridge for the purpose of common traffic
and travel and shall also investigate as to the value of such toll
bridge and from the estimate and data transmitted by the board or boards
of supervisors, or from such other information as the department of
transportation may secure, prepare an estimate of the probable cost of
acquiring such toll bridge. After such investigation such department of
transportation shall certify its approval or disapproval of such
resolution. If it shall disapprove such resolution, it shall certify its
reasons therefor to such board or boards of supervisors. If it shall
approve such resolution it shall certify its approval thereof to the
attorney general, and shall transmit to him the estimate made by the
department of transportation of the probable cost of acquiring such toll
bridge, together with any data the department of transportation may have
in its possession in relation to the value thereof.