Practice of Rumble Strips and Rumble Stripes (2016) / Chapter Skim
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Pages 7-20
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7 tion on the roadway. Overall, results show that rumble strips are mostly applied in rural settings and that installation varies by the type of rumble strip considered.
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8 Conditions Influencing Rumble Strip Installation Given that all 41 responding state DOTs use rumble strips, it is important to understand the factors that influence installation guidelines, and policies that contribute to variation in practice. The survey listed some common influencing factors, including shoulder width, pavement condition, and speed limit; and requested that states report their minimum required values for each applicable factor.
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9 DESIGN AND INSTALLATION PRACTICES These questions focused on understanding the state of practice for rumble strips and stripes in terms of how, when, and under what conditions they are used. The questions were asked, and are reported here, by category (general, shoulder rumble strips, center line rumble strips, and rumble stripes)
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10 FIGURE 1 Use of a sealant over rumble strips (survey question 7)
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11 FIGURE 3 Measuring rumble strip dimensions in the field (survey question 11)
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12 Shoulder Rumble Strips Shoulder Rumble Strip Placement Location Agencies were asked how close to the pavement edge line they install shoulder rumble stripes. Table 6 shows that the reported results range from 0 (i.e., directly on the edge)
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13 Length in Inches Inches No. of 6 7 8 9 10 11 12 13 14 15 16 Agencies 6 to 16 1 7 3 8 to 12 1 8 to 16 2 12 to 16 2 12 14 16 15 18 1 30 1 40 responding agencies.
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14 Intermittent Gaps Installed for Rumble Strips Agencies were asked whether if they used intermittent gaps on center line rumble strips, and if so, what factors determined where (Table 10)
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15 Gaps Created For: Number of Agencies Percent Bridge Decks 27 79.4 Other 23 67.6 Noise 20 58.8 Special Users 6 17.6 Bicycles 3 8.8 34 responding agencies. TABLE 10 REASONS AGENCIES CREATE INTERMITTENT GAPS WITHIN CENTER LINE RUMBLE STRIPS (survey question 27)
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16 FIGURE 7 Do center line rumble strip dimensions vary by roadway type (survey question 29)
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17 Crash modification factors -- A CMF is a multiplicative factor used to compute the expected number of crashes after implementing a given countermeasure at a specific site (CMF 2015)
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18 • Rumbles help snow plow operators to locate the center line of the roadway during snow storms. • Vibrations from rumbles help plow drivers detect the edge of the lane when snow covers the pavement markings.
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19 deterioration owing to the rumble or the inability to place a rumble on challenging surfaces (microsurfaces, thin asphalt, seal coat, chip seal, etc.)
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20 13 agencies rating these as "high" -- followed by noise. Both of these issues have the highest ratings in the medium complaint level category as well.
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