NF EN ISO 11819-1 : 2002

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Measuring principle
5 Measuring instruments
6 Test sites
7 Traffic conditions
8 Measuring procedure
9 Normalization of data
10 Reference road surface
11 Meteorological conditions
12 Background noise
13 Reported data
Annex A (informative) Vehicle categories
Annex B (informative) Validity and stability of the
        method
Annex C (informative) Monitoring the stability of
        vehicle noise emission
Annex D (informative) Example of a normalized reference
        surface
Annex E (informative) Example of test report
Annex F (informative)
Bibliography

Describes a method of comparing traffic noise on different road surfaces for various compositions of road traffic to evaluate different road surface types. Sound levels that represent either light or heavy vehicles at selected speeds are assigned to a certain road surface. Method applies to traffic travelling at constant speed, i.e. free-flowing conditions at posted speeds of 50 km/h and more. Where traffic is not free-flowing, such as junctions and where traffic is congested, the road surface is less important.