Paving and Lining
    The following table provides additional service life for applied paving and lining (SL
l
) for use in Equation14-1.Paved Or Lined  | Interior  | Exterior  | |||
|---|---|---|---|---|---|
Abrasion Level (SL LL ) | |||||
Level 1  | Level 2  | Level 3  | Level 4  | ||
Bituminous Paved Invert  | 25  | 25  | 25  | 0  | N/A  | 
Concrete Paved Invert  | 40  | 40  | 40  | 25  | N/A  | 
100% Bituminous Lined  | 25  | 25  | 25  | 0  | N/A  | 
100% Concrete Lined  | 50  | 50  | 50  | 35  | N/A  |