Section 37. Viewers of the site of a bridge appointed as aforesaid, shall have authority by virtue of their appointment, to report also whether any change in the course or bed of the road to be connected therewith, will be necessary, in order to the erection of such bridge at the most suitable place, or at the least expense, or in the best manner, and the same being approved by a majority of the commissioners of the county, and also by the court, such road shall be altered accordingly.