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# ASTM International - ASTM E1960-07

## Standard Practice for Calculating International Friction Index of a Pavement Surface

inactive
 Organization: ASTM International Publication Date: 1 April 2007 Status: inactive Page Count: 5 ICS Code (Other standards related to road engineering): 93.080.99
##### significance And Use:

This is the practice for calculating the IFI of the pavement. The IFI has proven useful for harmonization of the friction measuring equipment. F60 and Sp have proven to be able to... View More

##### scope:

1.1 This practice covers the calculation of the International Friction Index (IFI) from a measurement of pavement macrotexture and wet pavement friction. The IFI was developed in the PIARC International Experiment to Compare and Harmonize Texture and Skid Resistance Measurements. The index allows for the harmonizing of friction measurements with different equipment to a common calibrated index. This practice provides for harmonization of friction reporting for devices that use a smooth tread test tire.

1.2 The IFI consists of two parameters that report the calibrated wet friction at 60 km/h (F60) and the speed constant of wet pavement friction (Sp).

1.3 The mean profile depth (MPD) has been shown to be useful in predicting the speed constant (gradient) of wet pavement friction.

1.4 A linear transformation of the estimated friction at 60 km/h provides the calibrated F60 value. The estimated friction at 60 km/h is obtained by using the speed constant to calculate the estimated friction at 60 km/h from a measurement made at any speed.

1.5 The values stated in SI (metric) units are to be regarded as standard. The inch-pound equivalents are rationalized, rather than exact mathematical conversions.

1.6 This standard does not purport to address all of the safety concerns, if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

### Document History

May 1, 2023
Standard Practice for Calculating International Friction Index of a Pavement Surface
5.1 This is the practice for calculating the IFI of the pavement. The IFI has proven useful for harmonization of the friction measuring equipment. F60 and Sp have proven to be able to predict the...
September 1, 2015
Standard Practice for Calculating International Friction Index of a Pavement Surface
5.1 This is the practice for calculating the IFI of the pavement. The IFI has proven useful for harmonization of the friction measuring equipment. F60 and Sp have proven to be able to predict the...
September 1, 2011
Standard Practice for Calculating International Friction Index of a Pavement Surface
This is the practice for calculating the IFI of the pavement. The IFI has proven useful for harmonization of the friction measuring equipment. F60 and Sp have proven to be able to predict the speed...
ASTM E1960-07
April 1, 2007
Standard Practice for Calculating International Friction Index of a Pavement Surface
This is the practice for calculating the IFI of the pavement. The IFI has proven useful for harmonization of the friction measuring equipment. F60 and Sp have proven to be able to predict the speed...
August 10, 2003
Standard Practice for Calculating International Friction Index of a Pavement Surface
1.1 This practice covers the calculation of the International Friction Index (IFI) from a measurement of pavement macrotexture and wet pavement friction. The IFI was developed in the PIARC...
August 10, 2003
Standard Practice for Calculating International Friction Index of a Pavement Surface
1.1 This practice covers the calculation of the International Friction Index (IFI) from a measurement of pavement macrotexture and wet pavement friction. The IFI was developed in the PIARC...
July 10, 1998
Standard Practice for Calculating International Friction Index of a Pavement Surface
1.1 This practice covers the calculation of the International Friction Index (IFI) from a measurement of pavement macrotexture and wet pavement friction. The IFI was developed in the PIARC...