What does a lower IRI indicate about the riding quality of a pavement?

What does a lower IRI indicate about the riding quality of a pavement?

• A. Rougher riding index
• B. Smoother riding index
• C. Higher durability
• D. Higher maintenance needs

Answer: (B)

A lower International Roughness Index (IRI) indicates a smoother riding surface on the pavement. The IRI is a standardized measure of the roughness of a road surface, where a lower value reflects fewer deviations in the surface and consequently a better driving experience. Smooth pavement contributes to enhanced vehicle performance, increased comfort for passengers, and can lead to reduced tire wear. When IRI values decrease, it suggests that the surface irregularities, such as bumps and dips, are less pronounced, allowing for a more even and stable ride. This is especially important in road design and maintenance, as smoother pavements improve safety and reduce the likelihood of damage to vehicles. Overall, a lower IRI is synonymous with a higher quality of pavement riding experience.

A lower International Roughness Index (IRI) indicates a smoother riding surface on the pavement. The IRI is a standardized measure of the roughness of a road surface, where a lower value reflects fewer deviations in the surface and consequently a better driving experience. Smooth pavement contributes to enhanced vehicle performance, increased comfort for passengers, and can lead to reduced tire wear.

When IRI values decrease, it suggests that the surface irregularities, such as bumps and dips, are less pronounced, allowing for a more even and stable ride. This is especially important in road design and maintenance, as smoother pavements improve safety and reduce the likelihood of damage to vehicles. Overall, a lower IRI is synonymous with a higher quality of pavement riding experience.