Friction measurement methods and the correlation between road - VTI

Table 3.3 Summary of friction measurement devices from different countries, from Ohlsson et al. [41]B DK GB FIN F NL I N PL CH E S CZ DMeasured force Side Side Side Braking Braking or Braking Braking Side Braking Braking Braking Braking Braking BrakingsideSlip (%) - - - 100 100 86 100 - 100 13 13 Optimal 100 100Slip angle (deg) 15 12 20 - 15 - - 7.5 - - - - - -Load (kN) 2.5 2.45 2 1.8 2.5 2.0 - 1.0 4.0 4.93 4.93 3.0 - 3.5Tyre type Radial Radial Diagonal Diagonal Radial Diagonal Diagonal Diagonal Diagonal Diagonal Diagonal Diagonal Diagonal DiagonalTread Smooth Smooth Smooth Patterned Smooth Patterned Smooth Smooth Patterned Patterned Patterned PatternedDimension 165-400 165-15 3.00-20 4.00-8 165-400 5.60-13 - 4.00-8 6.70-15 7.50-14 7.50-14 165-15 155-14 6.40-13Name Stradographe Stradograf SCRIM RRL-TrailerStradographeCEBTPRWL-TrailerModelArianoMu-meter SkiddometerBV8SkiddometerBV8SkiddometerBV5Friction value 0.50 3 0.50 4 0.55 0.51 0.40 0.35 65 5 40 3 0.26Speed (km/h) 80 60 50 50 60 60 80Type of roadBrushedconcreteMax 2 yearsoldDifficultplacesAll roads All roads DifficultplacesVUD-1StuttgarterGerätAll roads DifficultplacesFriction value 0.45 0.40 2 0.50 60 3 0.33Speed (km/h) 50 1 60 50 60Type of road Asphalt Other roads Main roads Main roads Difficultplaces andmain roadsFriction value 0.40 55 3 0.42Speed (km/h) 50 40Type of road Other roads Other roads Main roadsVTI meddelande 911A3 New roads only4 In addition, the maximum reduction in friction value when increasing measuring speed with 20 km/h is 0.1.5 Measured with the Portable Skid-Resistance Tester (SRT, British Pendulum)