EN ISO 11819-1:2001

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

Description of a method of comparing traffic noise on different road surfaces for various compositions of road traffic for the purpose of evaluating different road surface types. Sound levels representing either light or heavy vehicles at selected speeds are assigned to a certain road surface. The method is applicable to traffic travelling at constant speed, i.e. free-flowing conditions at posted speeds of 50 km/h and upwards. For other driving conditions where traffic is not free-flowing, such as at junctions and where the traffic is congested, the road surface is of less importance.