Tommy Nantung INDOT Research & Development Division July 22, 2014 Costs & Revenues Associated with Overweight Truck Operations in Indiana Tommy Nantung INDOT Research & Development Division July 22, 2014

Study Objectives Main objective: Generate information to assist INDOT in updating or streamlining its permitting process for overweight (OW) trucks Intended to be based on data analysis pertaining to: Cost of asset (pavement & bridge) damage due to OW trucks, Enforcement costs and recommendations, Revenue trends

Background Information On one hand… INDOT needs highway operations policies that retain/attract industry even those that involve haulage of large loads, thereby enhancing economic development On the other hand… INDOT seeks policies that: protect billions of taxpayer $ invested in highway infrastructure do not lead to premature/accelerated deterioration of such assets through excess loading or undue safety hazard

Background Information Facility Damage vs. Repair Expenditure Traffic Load vs. Facility Damage Repair Expenditure vs. Permit/ License Fees

Estimating the Cost of Pavement Damage due to OW Trucks Route Type MPDC ($/ESAL-mile) Load Share (85%) Non-load Share (15%) Total Interstate 0.006 0.001 0.007 NHS Non-IS 0.055 0.010 0.065 Non NHS 0.218 0.038 0.256 Mean 0.093 0.016 0.109

Results for OW Trucks with GVW 80,001 -108,000 lbs

Results for OW Trucks with GVW 108,000 - 150,000 lbs Permit fee at time of the study (60 cents)

Results for OW Trucks with GVW > 150,000 lbs Permit fee at time of the study ($1.00)

Conclusions Pavement asset damage costs herein are derived as a function of: Pavement characteristics (e.g., functional class) Vehicle characteristics (GVW, axle spacing, axle load) Pavement damage cost estimates (average): $0.006/ESAL-mile on Interstates $0.218/ESAL-mile on non-NHS 9

Conclusions Consequences of ignoring reconstruction or maintenance expenditures (as in past studies) Non-consideration of these expenditures can result in underestimation of pavement damage cost by 79% and 83%, respectively. Bridge damage cost estimate Example: a 5-axle truck weighing 80-108 kips, crossing a steel bridge 0-20 yrs of age, assuming 25% load share of damage, the damage cost is $0.007/foot/pass. 10