Concrete is the worst, you can hear the roar from concrete road miles away. Porous tarmac is much quieter and much safer, in S Wales UK I remember vividly a tri

Concrete is the worst, you can hear the roar from concrete road miles away. Porous tarmac is much quieter and much safer, in S Wales UK I remember vividly a trial many years ago on a section of the M4. In very heavy rain, on the normal tarmac - much standing water, aquaplaning risk, low visibility, huge spray, then onto the porous section - zero spray, no standing water, was amazing like night and day. They never implemented though, double the cost, so not worth the many lives it would save!