International Roughness Index (IRI) is collected with IRIMETER 2 -device. The sensors are installed in two vehicles. One will cover A-, B- and C- roads that were surveyed by Reach-U. Another device and car will cover currently unclassified as well as D- and E- roads. Who can guess the average IRI of the country for each road class? The attached picture shows roughness for the road A11 (old numbering system). The winner gets a ride in a survey vehicle.