In November, Washington State residents will be asked to vote on Initiative 1125, a measure that would require that any tolls pay for  the roads on which they're levied. Proponents argue that the proposal would provide accountability by tying tolls directly to the projects they pay for; opponents argue that the purpose of tolls is to reduce congestion in the larger transportation system.

Initiative supporter Tim Eyman and opponent Rob Johnson, of the Transportation Choices Coalition, have their say in this week's ThinkTank.