Henry Billings Brown,
Covington Bridge Company v. Commonwealth of Kentucky…
“ It might be equally for the interest of Ohio to prescribe a higher rate of toll to induce her citizens to remain and fix their homes within their own state, and, as persons living in one state and doing business in another would necessarily have to cross the bridge at least twice a day, the rates of toll might become a serious question to them. Congress, and congress alone, possesses the requisite power to harmonize such differences, and to enact a uniform scale of charges which will be operative in both directions. ”
