The authority may invest or deposit any funds in the manner provided by part 6 of article 75 of title 24, C.R.S. In addition, the authority may direct a corporate trustee which holds funds of the authority to invest or deposit such funds in investments or deposits other than those specified by said part 6 if the board determines, by resolution, that such investment or deposit meets the standard established in section 15-1-304, C.R.S., the income is at least comparable to income available on investments or deposits specified by said part 6, and such investment will assist the authority in the financing, construction, maintenance, or operation of public highways.