Where can I find out more information on rumble strips?
Image of Rumble Strip from FHWA Website
There is a lot of very good information on rumble strips (and other rural safety ideas) on the FHWA’s Roadway Departure Safety Program website.
On the page, you can find links to lots of ideas on rural safety including rumble strips and stripes.
It is recommended to have pavement markings with rumble strips. If the lines are painted after the rumble strips are installed, the rumble strip and stripe are easier to see even in the rain as the vertical face of the rumble strip has paint on it that is not covered by water.