Division 3.2 Methods to measure the wetted frictional properties of the surfaceF1 United Kingdom Original text. Later amendments are not shown. (a)British Pendulum Number (BPN) method (b)ASTM E 1136 Standard Reference Test Tyre (SRTT14″) method Annotations Textual amendments F1 Inserted by Commission Regulation (EU) No 228/2011 of 7 March 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip testing method for C1 tyres (Text with EEA relevance). ← Division 3.1 Division 3.2 Division (a) →