Shoulder and Edge Line Rumble Strips - accommodating for bicyclists | Federal Highway Administration Technical Advisory

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Bicycle gaps: Where any width paved shoulder exists beyond the rumble strip and bicycles are allowed to ride, recurring short gaps should be designed in the continuous rumble strip pattern to allow for ease of movement of bicyclists from one side of the rumble to the other. A typical pattern is gaps of 10 to 12 feet between groups of the milled-in elements at 40 to 60 feet. . . .

Continuous vs. intermittent application: In the early days of rumble strip design, rumbles were formed intermittently onto freshly poured concrete shoulders. Since that time, the benefits of continuous rumble presence have been acknowledged and most rumble applications today provide for continuous application of the rumble line, which includes breaks only for pre-determined situations such as intersections, major driveways and recurring bicycle gaps.

Link: 

Shoulder and Edge Line Rumble Strips - accommodating for bicyclists | Federal Highway Administration Technical Advisory

MoBikeFed comment: We have been advocating for MoDOT to incorporate periodic gaps in its rumble strips for over 10 years. We believe now is the time for MoDOT to implement this simple, no-cost solution that improves bicycle safety while maintaining motorist safety.

http://mobikefed.org/content/2013/04/our-vision-modot-what-modot-should-...