Enter the number of cumulative 18-kip equivalent single axel loads over the design life of the pavement structure and the lane distribution factor into the Traffic Index Calculator. The calculator will evaluate the Traffic Index.
Traffic Index Formula
The following two example problems outline the steps and information needed to calculate the Traffic Index.
TI = 9.0*(ESAL * LDF / 10^6) ^ .119
Variables:
- TI is the Traffic Index ( )
- ESAL is the number of cumulative 18-kip equivalent single axel loads over the design life of the pavement structure
- LDF is the lane distribution factor
How to Calculate Traffic Index?
The following steps outline how to calculate the Traffic Index.
- First, determine the number of cumulative 18-kip equivalent single axel loads over the design life of the pavement structure.
- Next, determine the lane distribution factor.
- Next, gather the formula from above = TI = 9.0*(ESAL * LDF / 10^6) ^ .119.
- Finally, calculate the Traffic Index.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
number of cumulative 18-kip equivalent single axel loads over the design life of the pavement structure = 35,000,000
lane distribution factor = .75
TI = 9.0*(ESAL * LDF / 10^6) ^ .119 = ?
