Foreword

Revised test cases for updated version of Nord2000-road

The Danish Environmental Protection Agency has in 2004 asked DELTA to develop test examples, which are a set of presumptions together with corresponding computation results, suitable for verifying that computer programmes indeed do perform in conformity with the new Nordic prediction method for road traffic noise, Nord2000. The test examples were reported in “Environmental Project 1022/2005”.

The test examples have been selected after consultations with a project steering committee, and the examples comprise all relevant parameters in the prediction method. Intervals have been specified that computation results shall fall within in order for the software to be declared as in conformity with Nord2000.

The target group for the present report is consultants and developers or distributors of software for road traffic noise prediction.

The prediction method was revised during 2005 – 06 in a joint Nordic project, where both the propagation calculations and the source model for road traffic noise were adjusted. Since the revision of the method there have been a few cases where it has been necessary to adjust the algorithms of the method and furthermore, minor errors have been found in the software used to calculate the test examples. As a consequence, the Danish Environmental Protection Agency has asked DELTA to revise the computation results in the report mentioned above to be in accordance with the present version of Nord2000. The changes in the method have been approved by the Nord2000 Technical Committee.