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From page 22... ... . Typical Shoulder and Centerline Rumble Strip Practices in North America Various types, patterns, and designs of shoulder rumble strips are used in most states within the United States, but not all Canadian provinces install shoulder rumble strips. Read the entire page →
From page 23... ... R frwy; R multilane divided; R multilane undivided; R two-lane M 10 ft Gap 40 ft Cycle 3–6 in. Read the entire page →
From page 24... ... R frwy; R multilane divided; R multilane undivided; R two-lane M 12 ft Gap 60 ft Cycle 3 ft N N N N N N 0 in. Read the entire page →
From page 25... ... 3/03 Iowa* U frwy; U multilane divided; U multilane undivided; R freeway; R multilane divided; R multilane undivided; R two-lane M 12 ft Gap 60 ft Cycle 4 ft N 3,000 N N N Y 0 in. Read the entire page →
From page 26... ... U frwy; U multilane divided; U multilane undivided; U two-lane; R freeway; R multilane divided; R multilane undivided; R two-lane – Continuous 2 ft N N 3.75 in. Read the entire page →
From page 27... ... R frwy; R multilane divided; R multilane undivided; R two-lane M Continuous – 4 ft – – – – N 0 in. Read the entire page →
From page 28... ... U frwy; U frwy ramps; U multilane divided; U multilane undivided; R frwy; R frwy ramps; R multilane divided; R multilane undivided; R two-lane M Continuous N N N N N N N 4 in. (median) Read the entire page →
From page 29... ... U frwy; R frwy; R multilane divided; R multilane undivided; R two-lane M 12 ft Gap 40 ft Cycle; 12 ft Gap 60 ft Cycle; 16 ft Gap 64 ft Cycle 4 ft N N Variable 45 mph .6/mi or 34/100 MVMT Y 6 in. Read the entire page →
From page 30... ... * Rumble Strip Type Abbreviations: M = Milled RL= Rolled RS = Raised F = Formed. Read the entire page →
From page 31... ... The primary difference between the two tables is that under pattern characteristics for centerline rumble strips, there is no column for skip patterns, and Column 4 now indicates the lateral placement of the centerline rumble strip applications relative to the centerline pavement markings and lane. In addition, under minimum requirements for installation for centerline rumble strips, Column 5 indicates the minimum lane width requirements rather than the minimum shoulder width and lateral clearance requirements, which are more applicable to shoulder rumble strips. Read the entire page →
From page 32... ... Summary of North American centerline rumble strip practices. (continued on next page) Read the entire page →
From page 33... ... * Rumble Strip Type Abbreviations: M = Milled RS = Raised Table 7. Read the entire page →
From page 34... ... 8. Does your agency have a minimum shoulder width requirement for the installation of shoulder rumble strips? Read the entire page →
From page 35... ... of applications that have been installed by your agency? 36 Centerline rumble strips within pavement markings: 38.7% (12) Read the entire page →
From page 36... ... 28. Has your agency installed both centerline rumble strips and shoulder rumble strips along the same roadway? Read the entire page →
From page 37... ... • Shoulder rumble strips are being installed on a wide variety of roadway types including urban freeways, urban freeway on-ramps and off-ramps, urban multilane divided highways (nonfreeways) , urban multilane undivided highways (nonfreeways) Read the entire page →
From page 38... ... 3.7 1 5 Assess advantages/disadvantages of installing centerline rumble strips in passing zones 3.6 1 5 Determine optimum placement with respect to the centerline markings 3.6 1 5 Better quantify safety effectiveness (along different types of roads -- e.g., two-lane highway, multilane highways, etc.) 3.5 1 5 Determine effect on pavement performance 3.4 1 5 Better quantify safety effectiveness (along varying roadway geometry) Read the entire page →
From page 39... ... ; – Areas where the lateral clearance drops below a specified value and/or areas where the lateral clearance is limited due to adjacent guardrail, curb, or other obstacles; – Residential areas; – Catch basins and drainage grates; – Pavement joints; and – Median crossings. • Fewer transportation agencies use centerline rumble strips than shoulder rumble strips, and only a few transportation agencies that use centerline rumble strips have a written (i.e., formal) Read the entire page →
From page 40... ... In most cases, where centerline rumble strips have been installed along a rural multilane undivided highway, the installation was part of an extended project along a rural two-lane road, and rather than discontinuing the centerline rumble strips along shorter multilane sections within the limits of the entire project, the rumble strips were installed on the multilane sections as well. • Although many transportation agencies incorporate a wide range of criteria that directly impact installation requirements for shoulder rumble strips, very few criteria are specified for the installation of centerline rumble strips. Read the entire page →

From page 22...

... . Typical Shoulder and Centerline Rumble Strip Practices in North America Various types, patterns, and designs of shoulder rumble strips are used in most states within the United States, but not all Canadian provinces install shoulder rumble strips.