"Bicycle-friendly rumble strips" (PDF): https://www.codot.gov/programs/research/pdfs/2001/bfrs.pdf/ https://www.codot.gov/programs/research/pdfs/2001/bfrs.pdf/

"Bicycle-friendly rumble strips" (PDF): https://www.codot.gov/programs/research/pdfs/2001/bfrs.pdf/ https://www.codot.gov/programs/research/pdfs/2001/bfrs.pdf/ May 2001, Colorado DOT research. There's a clear table 7, "bicyclist preference versus vehicle sound and vibration levels" but the conclusion is basically: "There is no ideal solution. The motor vehicle tables are very nearly opposite the bicycle table for all configurations of rumble strips."