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If it there is water on the road and it might even possibly be 1/16 inch of rain, slow down to 55 MPH max. Tires will hydroplane at the square root of the tire pressure x 10.
Easy example: 36 PSI tire, has a square root of 6 and then x10 =60. At 60 you will hydroplane. One reason the big trucks can go faster is they run 90 PSI or more. With a 90 PSI tire the square root is 9.48 x 10 = 94 MPH. Hopefully none of them are going 90 in the rain. They may not hydroplane but the traction on the road is lowered for everyone.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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