Traffic and Revenue Model Assumptions
Growth Rates
• Background 1.3%
• Congestion Driven (2% additional)
• Toll Inflation Factor (1% additional)
Capacity Constraints
• Elgin-O'Hare Extension/O'Hare Bypass
• For 120,000 vehicles per day (VPD) to 150,000 VPD, reduce congestion driven growth by 1%
• Over 150,000 VPD, reduce growth to background growth only
• Cap volume at 170,000 VPD
• Roadways feeding Elgin-O'Hare Extension/O'Hare Bypass
• No constraints on I-294 - traffic diverted from I-290 will be able to use I-294 for access
• No constraints on I-90 to the north where bypass connects
• All ramps to and from the proposed roadway will have sufficient capacity
Western Terminal Access
• All traffic pays toll to enter the western terminal
Tollelasticity
• 33% reduction in traffic for doubling of toll
Ramp up
• 5 years for road construction
• 3 years for western terminal
Electronic Toll Share (I-PASS)
• 60% opening day
• Escalate to 80% in 2030
Toll Rates
• 3% annual growth rate based on CPI rounded to the nearest nickel
• Tolls increase every 3 years