Annex I Classification of road surface characteristics 1. Noise reduction Table 1 Noise reduction (NR) classes Noise reduction (NR) in dB(A) NR 11.0 ≥ 8.0 NR < 11.0 ≤ 5.0 NR < 8.0 ≤ 2.0 NR < 5.0 ≤ -1.0 NR < 2.0 ≤ -4.0 NR < -1.0 ≤ NR < -4.0 2. Skid resistance Table 2 Skid resistance (SR) classes Skid resistance (SR) in friction coefficient SR 1.14 ≥ 0.91 SR < 1.14 ≤ 0.78 SR < 0.91 ≤ 0.64 SR < 0.78 ≤ 0.52 SR < 0.64 ≤ 0.38 SR < 0.52 ≤ SR < 0.38 3. Rolling resistance reduction Table 3 Rolling resistance reduction (RRR) classes
Annex I Classification of road surface characteristics 1. Noise reduction Table 1 Noise reduction (NR) classes Noise reduction (NR) in dB(A) NR ≥ 11.0 8.0 ≤ NR < 11.0 5.0 ≤ NR < 8.0 2.0 ≤ NR < 5.0 -1.0 ≤ NR < 2.0 -4.0 ≤ NR < -1.0 NR < -4.0 2. Skid resistance Table 2 Skid resistance (SR) classes Skid resistance (SR) in friction coefficient SR ≥ 1.14 0.91 ≤ SR < 1.14 0.78 ≤ SR < 0.91 0.64 ≤ SR < 0.78 0.52 ≤ SR < 0.64 0.38 ≤ SR < 0.52 SR < 0.38 3. Rolling resistance reduction Table 3 Rolling resistance reduction (RRR) classes
ECE-TRANS-WP.29-GRB-2018-08e.docx