1. CLEPA presentation supporting justification of working document GRB 2008/5r1, proposing amendments to R59. Informal document No. GRB-49-08 (49th GRB, 16-18 February 2009, agenda item 4.)

2. 1.New driving-by test of R51 in R59 Measurement accuracy 2. Stationary noise test Paragraph 6.2.2. Content

3. Conditions of measurement Measurement accuracy –The current R59 regulation results in some practical inconsistensies and confusions with regard to the measurement accuracy and rounding off practice to the nearest integer dB(A) value. CLEPA proposes a simplified and uniform rule, taking into account the 1 dB(A) measurement inaccuracy.

4. Reference noise level of vehicle type approval : Running vehicle Paragraph 6.2.2.1.(a). Reference vehicle type approval value is 72 dB(A) Measured dB(A) Rounded dB(A)Result Replacement system 173,974NOK Replacement system 273,574NOK Replacement system 373,473OK Replacement system 473 OK Replacement system 572,573OK Replacement system 672,372OK Replacement system 771,872OK Tolerance 1 dB(A) after rounding off to the nearest integer

5. Back to back test : Running vehicle Current regulation New proposal OEM system Replacement systemOEM system Replacement systemResult Measured dB(A) Measured and rounded dB(A) 74,475,97476NOK 74,475,57476NOK 74,474,97475NOKOK 73,975,57476NOK 73,975,47475NOK 73,975,07475NOK 73,974,57475NOKOK 73,575,07475NOK 73,574,67475NOK 73,574,374 OK 73,573,974 OK 73,573,674 OK 73,573,37473OK Tolerance 1 dB(A) after rounding off to the nearest integer Paragraph 6.2.2.2 (a)

6. 2. Justification for the CLEPA amendment proposal of the stationary noise test procedure in R59.

7. Deceleration vehicle 1 Prox. 50cm / 45° Static noise test

8. Deceleration vehicle 2 Prox. 50cm / 45° Static noise test

9. Prox. 50cm / 45° Deceleration vehicle 3 Static noise test

10. Stationary noise test Further to the test results presented by CLEPA during last GRB, the previous graphs illustrate the poor reproducebility of the current stationary noise test. CLEPA proposes to take into account this poor reproducebility by introducing a 2 dB(A) uniform tolerance on the comparison. The current test procedure however will not be modified.

11. Reference noise level of vehicle type approval : Stationary vehicle Paragraph 6.2.2.1.(b) Reference vehicle type approval value is 77 dB(A) Measured dB(A) Rounded dB(A)Result Replacement system 180,581NOK Replacement system 279,580NOK Replacement system 379,479OK Replacement system 478,278OK Replacement system 577,377OK Replacement system 676,577OK Replacement system 776,276OK Tolerance 2 dB(A) after rounding off to the nearest integer