Such rumble strips will only possibly save a motorists life and can only negatively impact cycling safety. If a cyclist is present and a motorist drifts over it will be too late for any warning.
Many rural roads have such rumble on them in AZ and they are exceedingly jarring to cycle over, yet one must regularly cross the rumble to avoid debris, other cyclists, right turn lanes, parked/disabled vehicles, road construction signs, etc.
Al
http://safety.fhwa.dot.gov/roadway_d...le_library.htm
http://safety.fhwa.dot.gov/roadway_d...s/gapstudy.pdf
http://www.bccc.bc.ca/srs/srs_photo_gallery8.html