TYROSAFE, Oct 22, SURF 2008, J Foucard/G DIMITRI, Michelin 1 SURF 2008 – PORTOROZ SLOVENIA TYROSAFE WORKSHOP (Communication limited to passenger car tires)

TYROSAFE, Oct 22, SURF 2008, J Foucard/G DIMITRI, Michelin 2 TYRE NOISE REQUIREMENTS WITHIN THE BALANCE OF PERFORMANCES REQUIRED FOR A SUSTAINABLE MOBILITY  What are the interactions between Tyre and Road to produce the Vehicle-Tire-Road performances?  To what extent can tyre manufacturers, road manufacturers, and road owners act independently, or should they join their efforts to make progress on:  Pollution: NOISE  Safety: WET GRIP  Emissions: ROLLING RESISTANCE  Natural resources: WEAR

TYROSAFE, Oct 22, SURF 2008, J Foucard/G DIMITRI, Michelin 3 Tyre-Road Interaction High None Wet Grip Noise Rolling Resistance Wear  High benefit of local pavement solutions  Progress in the hands of tire manufacturers, road manufacturers, and road owners  Low impact of pavement characteristics on service to customer and society  Progress mainly in the hands of tire manufacturers Safety Natural resources Pollution Emissions

TYROSAFE, Oct 22, SURF 2008, J Foucard/G DIMITRI, Michelin 4 Indentation Mechanisms  High interaction between the Tyre and Road characteristics Road Tyre Tread design Ampli. / horn effect 1mm - 1cm Compound visco- elasticity Road texture Organ Pipe Air Squeezing Ground Attenuation Acoustic network Micro slippage Slippage Archi- tecture Vibrations Percussion Tye road interaction: Rolling Sound Emissions

TYROSAFE, Oct 22, SURF 2008, J Foucard/G DIMITRI, Michelin 5 Braking distance: influencing factors Order of magnitude of influencing factors on braking distance

TYROSAFE, Oct 22, SURF 2008, J Foucard/G DIMITRI, Michelin 6 The pavement is by far the biggest contributor to wet grip variability  High-level wet-grip & high level wear resistance pavement technologies are available  Improve tyre performance on these black spots conditions Road pavement microtexture: Eliminate black spots 0,3  0,5 (SFC) Tyre/pavement interaction: WET GRIP