a new four lane state highway (posted speed limit 45 mph) is planned and you as the engineer are responsible for developing cross sections. draw a typical cross section, while keeping in mind that there is only 74 feet of r.o.w. the entire 74 feet of r.o.w. must be used. there is a requirement of a concrete barrier in the median. highway design standards should be implemented. what is the width of the median in this cross section? answer should be in feet.