Effects of international roughness index on vehicle emissions

Authors:
  • PAPriscilla Oliveira Azevedo
    Priscilla Oliveira Azevedo
  • EJErnesto Ferreira Nobre Junior
    Ernesto Ferreira Nobre Junior
  • AAArielle Elias Arantes
    Arielle Elias Arantes
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Abstract
Pavement conditions, such as roughness, measured by the international roughness index (IRI) play an essential role in improving vehicle fuel economy and GHG emission reduction. Considering this, the objective of this study was to investigate the relationship between IRI and vehicle emissions, derived from the HDM-4 model. IRI and speed values were collected for every 100 m for two road segments located in Brazil, State of Cearé, using a smartphone app called SmartIRI. The IRI values were inserted in the HDM-4 model, as well as the vehicle and road characteristics, in order to derive Instantaneous Fuel Consumption (IFC) and tailpipe emissions (TPE) for CO