Measuring International Roughness Index (IRI) is one of the tasks in the process of checking, monitoring and evaluating road surface quality. In Vietnam, the types of IRI measuring devices are still limited. There are specialized devices with high accuracy and speed, but the cost is high. Therefore, they are not commonly used for regular monitoring. To measure IRI regularly and conveniently, it is necessary to use device that is easy to use, convenient, with high speed, high accuracy, but at a reasonable cost. The STAMPER (System with Two Accelerometers for Measuring Profile, Enabling Real-time data collection) from Taisei Rotec company (Japan) has been used to measure on different types of roads in Hanoi: city road, expressway and national highway. Data will be collected many times, with speed ranges and by many types of vehicles. The results show that STAMPER can measure IRI quickly and stably. It is easy to install on many type of vehicles and gives accurate, reliable measurement results