Costs & Revenues Associated with Overweight Truck Operations in

IndianaTommy NantungINDOT 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

Traffic Load vs. Facility Damage

Facility Damage

vs. Repair Expenditur

e

Repair Expenditu

re 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

Interstate NHS Non-IS Non NHS Mean0.00

0.05

0.10

0.15

0.20

0.25

0.30

Non-load Re-lated PDC

Load-related PDC

Route Type

Marg

inal P

DC

($

/ES

AL-m

ile)

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

4-Axl

es

5-Axl

es

6-Axl

es

7 & M

oreA

xles

Avera

ge fo

r 80-

108K

0.00

0.35

0.70

1.05

1.40

0.03 0.01 0.00 0.02

0.28

0.130.04

0.15

1.12

0.53

0.14

0.590.48

0.22

0.06

0.25

IS NHS Non-IS Non NHS Avg

Marg

inal P

DC

($

/ES

AL-m

ile)

Permit fee at time of the study (35 cents)

4-Axles 5-Axles 6-Axles 7-Axles 8-Axles 9 & More Axles

Avg. 108-150K

0.00

0.60

1.20

1.80

2.40

3.00

3.60

0.08 0.04 0.03 0.01 0.01 0.00 0.03

0.75

0.400.23

0.12 0.130.03

0.28

2.98

1.58

0.91

0.49 0.52

0.12

1.101.27

0.67

0.390.21 0.22

0.05

0.47

IS NHS Non-IS Non NHS Avg

Marg

inal P

DC

($

/ES

AL-m

ile)

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)

7-Axles 8-Axles 9-Axles 10-Axles 11-Axles 12 & More Axles

Avg. > 150K

0.0

1.0

2.0

3.0

0.05 0.05 0.04 0.05 0.06 0.05 0.05

0.49 0.480.40 0.43

0.520.45 0.46

1.941.90

1.571.70

2.07

1.77 1.82

0.83 0.810.67 0.72

0.880.76 0.78

IS NHS Non-IS Non NHS Avg

Marg

inal P

DC

($

/ES

AL-m

ile)

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

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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.

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