In addition to public school students or pupils authorized to be transported to the public schools by virtue of Section 37-41-3, the local school board, with the concurrence of the board of supervisors, in their discretion and with local tax funds or other local contributions or support exclusively and without state appropriations, may provide transportation for students or pupils to the public schools whenever the within described boards or officers find that extraordinary circumstances and conditions are prevalent in said school district in regard to such matters as the public health and safety, school facilities, location of the school site, unusual economic growth and population expansion, newly expanded municipal corporation limits, the general welfare, and any other emergency facts and conditions which may be deemed by said authorities to be in the best interest of the political subdivision.