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Shifting to Time-of-Day Tolling on 183A Is Not Likely to Meet Traffic and Revenue Objectives

• Reducing off-peak toll levels on 183A will reduce revenues, although the losses are likely to be small for modest reductions in off-peak toll levels.
• Charging lower off-peak toll rates causes a very small portion of trips to shift from peak to off-peak travel. Rather than shifting departure times, motorists are more likely to shift from the parallel, untolled roadway (183) to the tolled 183A when off-peak toll rates are reduced. Consequently, reducing off-peak toll rates has little effect on peak-period traffic conditions on 183 or on downstream facilities.
• To remain revenue neutral, modest reductions in off-peak toll levels will need to be accompanied by modest increases in peak toll rates.