“…Currently, INDOT quantifies pavement smoothness as International Roughness Index (IRI) and pavement friction as friction number (FN). It was found elsewhere that pavement smoothness does not change much before and after chip seal due to that chip seal, in particular single chip seal, is not thick enough to affect the profile of road surface (Lee, Ahn, Shields, Harris, & Li, 2013). This may imply that pavement smoothness may not be related to the quality of new chip seal.…”