Track characteristics. The surface shall be a dense asphalt surface with a uniform gradient of not more than two per cent and shall not deviate more than 6 mm when tested with a 3 m straight edge. The test surface shall have a pavement of uniform age, composition, and wear. The test surface shall be free of loose material or foreign deposits. The maximum chipping size shall be from 8 mm to 13 mm. The average macro texture depth measured as specified in ASTM E 965-96 (reapproved 2006) shall be (0.7 ± 0.3) mm. The surface friction value for the wetted track shall be established by one or other of the following methods according to the discretion of the Contracting Party.
1.1.1. Standard Reference Test Tyre (SRTT) method This method uses the Standard Reference Test Tyre SRTT16. Using the procedure described in paragraph 4.2. of part (A) of this Annex, perform in the same area where the average macro texture depth was measured one braking test of the reference tyre, consisting of at least six (6) valid test runs in the same direction. Evaluate the braking test as described in paragraphs 4.2.8.1. and 4.2.8.2. of part (A) of this Annex. If the coefficient of variation CVµ exceeds 4 per cent, dismiss the results and repeat the braking test. The arithmetic mean ( ) of the measured peak braking force coefficients shall be corrected for the effects of temperature as follows: where ϑ is the wetted track surface temperature in degrees Celsius, and . The temperature corrected average peak braking force coefficient (µpeak,corr) shall be not less than 0.65 and not greater than 0.90. The test shall be conducted using the lanes and length of the track to be used for the wet grip test. For the trailer method, testing is run in such a way that braking occurs within 10 meters distance of where the surface was characterized.
1.1.2. The Type Approval Authority shall satisfy itself of the characteristics of the track on the basis of evidence produced in test reports.
Track characteristics. The surface shall be a dense asphalt surface with a uniform gradient of not more than two per cent and shall not deviate more than 6 mm when tested with a 3 m straightedge. The test surface shall have a pavement of uniform age, composition, and wear. The test surface shall be free of loose material or foreign deposits. The maximum chipping size shall be from 8 mm to 13 mm. The sand depth measured as specified in EN13036-1:2001 and ASTM E 965- 96 (reapproved 2006) shall be 0.7 ± 0.3 mm. The surface friction value for the wetted track shall be established by one or other of the following methods according to the discretion of the Contracting Party.
1.1.1. Standard reference test tyre (SRTT) method The average peak braking coefficient (μ peak average) of the ASTM E1136 - 93 (reapproved 2003) reference tyre (Test method using a trailer or a tyre test vehicle as specified in clause 2.1) shall be 0.7 +/- 0.1 (at 65 km/h and 180 kPa). The measured values shall be corrected for the effects of temperature as follows: pbfc = pbfc (measured) + 0.0035 · (t - 20)
Track characteristics. The track shall have a dense asphalt surface with a gradient in any direction not exceeding 2 per cent. It shall be of uniform age, composition, and wear and shall be free of loose material or foreign deposits. The maximum chipping size shall be 10 mm (tolerances permitted from 8 mm to 13 mm) and the sand depth measured as specified in ASTM E-965 shall be 0.7 ± 0.3 mm. The surface friction value for the wetted track shall be established by one or other of the following methods:
1.1.1. Standard reference test tyre (SRTT) method When tested using the SRTT and the method given in paragraph 2.1. the average peak brake force coefficient (pbfc) shall be between 0.6 and 0.8. The measured values shall be corrected for the effects of temperature as follows: pbfc = pbfc (measured) + 0.003 · 5(t − 20) where "t" is the wetted track surface temperature in degrees Celsius. The test shall be conducted using the lanes and length of the track to be used for the wet grip test;
1.1.2. British pendulum number (BPN) method The averaged British pendulum number (BPN) of the wetted track, measured in accordance with the procedure given in the American Society for Testing and Materials (ASTM) standard 303-93 (re-approved 1998) and using the pad as specified in ASTM standard E 501-94, shall be between 40 and 60 after temperature correction. Unless temperature correction recommendations are indicated by the pendulum manufacturer, the following formula can be used: BPN = BPN (measured value) + 0.34 · t − 0.0018 · t² − 6.1 where "t" is the wetted track surface temperature in degrees Celsius. In the lanes of the track to be used during the wet grip tests, the BPN shall be measured at intervals of 10 m along the length of the lanes. The BPN shall be measured 5 times at each point and the coefficient of variation of the BPN averages shall not exceed by 10 per cent.
1.1.3. The type approval authority shall satisfy itself of the characteristics of the track on the basis of evidence produced in test reports.
Track characteristics. The surface shall be a dense asphalt surface with a uniform gradient of not more than two per cent and shall not deviate more than 6 mm when tested with a 3 m straight edge. The test surface shall have a pavement of uniform age, composition, and wear. The test surface shall be free of loose material or foreign deposits. The maximum chipping size shall be from 8 mm to 13 mm. The average macro texture depth measured as specified in ASTM E 965-96 (reapproved 2006) shall be (0.7 ± 0.3) mm. The surface friction value for the wetted track shall be established by one or other of the following methods according to the discretion of the Contracting Party."
Track characteristics. The track shall have a dense asphalt surface with a gradient in any direction not exceeding 2 per cent. It shall be of uniform age, composition, and wear and shall be free of loose material or foreign deposits. The maximum chipping size shall be 10 mm (tolerances permitted from 8 mm to 13 mm) and the sand depth measured as specified in ASTM standard E 965-96 (2006) shall be 0.7 ± 0.3
Track characteristics. The surface shall be a dense asphalt surface with a uniform gradient of not more than two per cent and shall not deviate more than 6 mm when tested with a 3 m straight edge. The test surface shall have a pavement of uniform age, composition, and wear. The test surface shall be free of loose material or foreign deposits. The maximum chipping size shall be from 8 mm to 13 mm. The average macro texture depth measured as specified in ASTM E 965-96 (reapproved 2006) shall be (0.7 ± 0.3) mm. The surface friction value for the wetted track shall be established by one or other of the following methods according to the discretion of the Contracting Party."
Paragraph 1.1.1. amend to read:
1.1.1. Standard Reference Test Tyre (SRTT) method This method uses the Standard Reference Test Tyre SRTT16. Using the procedure described in paragraph 4.2. of part (A) of this Annex, perform in the same area where the average macro texture depth was measured one braking test of the reference tyre, consisting of at least six (6) valid test runs in the same direction. Evaluate the braking test as described in paragraphs 4.2.8.1. and 4.2.8.2. of part (A) of this Annex. If the coefficient of variation CVµ exceeds 4 per cent, dismiss the results and repeat the braking test. The arithmetic mean (ߤത) of the measured peak braking force coefficients shall be corrected for the effects of temperature as follows: ߤǡൌ ߤതܽήሺߴെߴሻ where ׇis the wetted track surface temperature in degrees Celsius, ܽൌ ͲǤͲͲ Ԩʹିଵand ߴൌʹͲ Ԩ. The temperature corrected average peak braking force coefficient (µpeak,corr) shall be not less than 0.65 and not greater than 0.90. The test shall be conducted using the lanes and length of the track to be used for the wet grip test. For the trailer method, testing is run in such a way that braking occurs within 10 meters distance of where the surface was characterized."
Track characteristics. The surface shall be a dense asphalt surface with a uniform gradient of not more than two per cent and shall not deviate more than 6 mm when tested with a 3 m straightedge. The test surface shall have a pavement of uniform age, composition, and wear. The test surface shall be free of loose material or foreign deposits. The maximum chipping size shall be from 8 mm to 13 mm. The sand depth measured as specified in EN13036-1:2001 and ASTM E 965- 96 (reapproved 2006) shall be 0.7 ± 0.3 mm. The surface friction value for the wetted track shall be established by one or other of the following methods according to the discretion of the Contracting Party.
1.1.1. Standard reference test tyre (SRTT) method The average peak braking coefficient (μ peak average) of the ASTM E1136 - 93 (reapproved 2003) reference tyre (Test method using a trailer or a tyre test vehicle as specified in clause 2.1) shall be 0.7 +/- 0.1 (at 65 km/h and 180 kPa). The measured values shall be corrected for the effects of temperature as follows: pbfc = pbfc (measured) + 0.0035 · (t - 20) where "t" is the wetted track surface temperature in degrees Celsius. The test shall be conducted using the lanes and length of the track to be used for the wet grip test. For the trailer method, testing is run in such a way that braking occurs within 10 metres distance of where the surface was characterized.
1.1.2. British pendulum number (BPN) method The averaged British Pendulum Number (BPN) British Pendulum Tester method as specified in ASTM E 303-93 (reapproved 2008) using the Pad as specified in ASTM E 501-08 shall be (50 ± 10) BPN after temperature correction. BPN shall be corrected by the wetted road surface temperature. Unless temperature correction recommendations are indicated by the British pendulum manufacturer the following formula can be used:
