Dear Dr. Boli: Why is it that almost all our roads and highways are opened free of charge to all and sundry, whereas trains and streetcars, which are much more efficient in terms of cost per person carried, demand payment from passengers? —Sincerely, A Woman Without a Car.
Dear Madam: It is because rail transit is a human construction, whereas highways, like rivers and seas, were made by God, probably on the third day of creation (see Genesis 1:9-13). At least that is the only explanation Dr. Boli can come up with.