Hi- I'm looking for any research that has computed the total monetary investment being made each year towards driving (public and private investment) and comparing that to what that same investment would buy if used exclusively for public transportation. I'm thinking of doing a thesis paper on the total investment Los Angeles County makes to auto transport over a 30 year period, and estimating the purchasing power of that same money if used only for public transportation. How far would that money go towards building a first-class transit system in relatively low density L.A.? Anyone know of similar research that might be helpful? Thanks in advance.