INTERNATIONAL ROUGHNESS INDEX (IRI)
Advanced roughness evaluation to measure ride quality, optimize maintenance, and enhance road performance.
Measuring Smoothness. Improving Ride Quality.
The International Roughness Index (IRI) is a globally recognized standard for evaluating the smoothness of roads. At GB ROAD & BRIDGE CONSTRUCTION COMPANY, we use advanced profiling systems to collect high-precision data that helps agencies plan, prioritize, and deliver better road networks.
IRI data supports data-driven decision making for maintenance, rehabilitation, and new construction projects, ensuring safer, smoother, and more comfortable journeys for all road users.
5,000+
Kilometers
Road Network Assessed
200+
Projects
Completed Successfully
15+
Years of Engineering
Excellence
50+
Years of Engineering
Excellence
comprihensive iRI evaluation
High precision data collection
Advanced inertial profilers capture road roughness efficiently and accurately
IRI Calculation & Analysis
Compute IRI values as per international standards with precision.
Detailed Reporting
Clear, easy to understand reports with charts, graphs & maps.
Network Level Assessment
Evaluate entire road networks for better planning & budgeting.
Maintenance Planning
Use IRI trends to prioritice maintenance and improve pavement life.
Quality Assurance
Strict processes to ensure credible and defensible results.
Better Data.
Better Decisions.
IRI helps identify rough road segments, prioritize rehabilitation, and monitor Improvements over time. Our analysis ensures the right treatment at the right time for the best results.
Improved Ride Comfort
Smoother roads for a better driving experience.
Enhanced Road Safety
Reduces vehicle wear and accident risk.
Cost Effective Maintenance
Target resources where they are needed most.
Performance Tracking
Monitor changes and measure improvement.
from inspection to action
Step 1
Data Collection
Collect roughness data using inertial profiling systems.
Step 2
Data processing
Process raw data and apply standard filtration and corrections
Step 3
IRI Calculation
Calculate IRIvalues as per ASTM E1026-22 standards.
Step 4
Data Analysis
Analyze results to identify problem areas and trends
Step 5
Reporting
Prepare detailed reports with maps, charts and recommendations.
Step 6
Decision Support
Help clients plan and Implement the right maintenance strategy.
Smarter Decisions. Stronger Infrastructure.
Partner with GB ROAD & BRIDGE CONSTRUCTION COMPANY for reliable pavement evaluation and engineering solutions that drive sustainable infrastructure.
Frequently Asked Questions
The International Roughness Index (IRI) is a globally recognized standard used to measure the smoothness or roughness of a road surface. It quantifies how comfortable and consistent a road is to drive on by measuring surface irregularities over a specified distance.
IRI is an essential indicator of pavement performance and ride quality. It helps transportation agencies and infrastructure managers identify deteriorating road conditions, prioritize maintenance, and improve driving comfort and safety.
IRI is measured using specialized equipment mounted on survey vehicles that record pavement surface profiles while traveling at normal traffic speeds. The collected data is processed to calculate the road’s roughness, typically expressed in meters per kilometer (m/km) or inches per mile (in/mi).
IRI surveys can be performed on highways, urban roads, rural roads, airport runways, industrial roads, parking facilities, and other paved transportation networks.
An IRI survey provides objective measurements of pavement smoothness, supports pavement management programs, improves maintenance planning, enhances ride quality, and helps extend pavement service life while reducing long-term maintenance costs.
A high IRI value indicates a rougher pavement surface, which may result in reduced ride comfort, increased vehicle operating costs, higher fuel consumption, and the need for maintenance or rehabilitation.