Income tax can be used on roads. It may vary on the location as to whether that's the case or not, however.
I was providing the gas tax as an example of how they'll be using transaction-based taxes to replace the income tax revenue. Transaction-based taxes (sales tax etc.) have a heavier impact on lower-income households. This is the same across the board, not just on gas--the lower your income, the harder you get hit by sales tax and the like.
Really what I'd like to see from a taxation standpoint would be a flat tax for everybody, businesses included. Though I'd say tourist stuff should get a lower corporate tax, but have transactional taxation to make up for it--in other words, lower corporate tax to encourage tourist businesses, which brings in people from out of state and the like and then takes their money at the counter via tourism sales tax.