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13 Appendix B:NCDOT Documents pertaining to rumble strips and bicycle traffic R-44 • The beginning of a rumble strip/stripe pattern should be delineated in accordance with MUTCD criteria(Section 9C 06)on any facility that bicycles are legally allowed to operate. • The NCDOT Division of Bicycle and Pedestrian Transportation will be provided an opportunity to comment on any project implementing rumble strips/stripes on facilities subject to this practice. • Turn bay rumbles may continue to the beginning of the full width lane,if the paved shoulder width remains the same as the through-lane shoulder width. • NCDOT recognizes and is sensitive to the fact that noise may be an issue.However,if there is a documented safety problem where no other reasonable cost effective solution is available then rumble strips should be installed.This approach has been supported through other Departmental actions. CONSIDERATIONS FOR BICYCLE TRAFFIC The following should be considered for all facilities where bicycles are legally allowed to operate: • It is desirable to provide a nominal width of four(4)feet of useable shoulder between the outside edge of the shoulder rumble strip/stripe to the edge of pavement. However,even though a four foot nominal width is desired,it will not preclude the installation of a proven safety countermeasure where there is the presence of treatable lane departure events. Also,the condition of the shoulder itself should be considered in determining whether or not to provide the four foot nominal riding width for bicycle traffic. • The width of shoulder rumble strips/stripes may vary between 8 and 16 inches.The engineer should determine design and placement. • Gaps in milled patterns,varying between 6 and 12 feet,may be provided to allow bicyclists to move between the through lane and the right shoulder to avoid vehicles, debris,etc.,but the pattern should be a minimum of a 5:1 rumble-to-gap ratio.The Engineer should determine design and placement. • No gaps should be provided on the left(median)side of divided highways.Gaps should not be provided on interstate or freeway facilities. • Consideration should be given to the alignment of the roadway in the direction of travel from the perspective of bicyclists. • Consideration should be given to the grade and speed at which bicyclists may be traveling. Effective 3-5-12 Page 2 of 2