First link: "Outcalt 2001 [9] Tested vibration and sound readings for cyclists and 4 vehicles types. SRS rated best by cars and worst by cyclists. Recommended d

First link: "Outcalt 2001 [9] Tested vibration and sound readings for cyclists and 4 vehicles types. SRS rated best by cars and worst by cyclists. Recommended design was 3/8″ depth, 12″ width, 48′ skip pattern with SRS and 12′ gap"