Rumble Strips and Rumble Stripes

Decision Support Guide for the Installation of Shoulder and Center Line Rumble Strips on Non-Freeways

Other Resources

The FHWA maintains a Rumble Strips and Rumble Stripes website, which is accessible at safety.fhwa.dot.gov/roadway_dept/pavement/rumble_strips. The website contains resources on safety; design and construction; accommodating all users; mitigating noise; pavement and maintenance; and policies, guidance, and research. The website also contains implementation fact sheets for designers and implementation guides for technical specialists focusing on noise, pavements, and bicycle accommodation. The FHWA also has technical advisories on Rumble Strips for Shoulder and Edge Line Rumble Strips (T 5040.39, Revision 1) and Center Line Rumble Strips (T 5040.040, Revision 1).

For more information on rumble strip or alternative countermeasure effectiveness, visit the CMF Clearinghouse at www.cmfclearinghouse.org.

For more information on the HSM, visit www.highwaysafetymanual.org.

Appendix A–Example CMF Tables

Appendix A contains CMFs available on the CMF Clearinghouse for CLRS, SRS, and their combination in the following tables:

Table 3: Sample CMF Clearinghouse CMFs for CLRS on Rural, Two-Lane Highways.
Table 4: Sample CMF Clearinghouse CMFs for SRS on Rural, Two-Lane Highways.
Table 5: Sample CMF Clearinghouse CMFs for SRS on Rural, Multilane Highways.
Table 6: Sample CMF Clearinghouse CMFs for CLRS and SRS on Rural, Two-Lane Highways.

Each table provides 5-star and 4-star CMFs covering a breadth of crash types, crash severity, jurisdictions, AADTs, and geometric conditions. The tables report the ID for each CMF, the estimated CMF, and the lower and upper 95-percent confidence intervals. These are currently the highest quality CMFs available for each installation type. Note the countermeasure name, number of lanes and area type are already accounted for in these tables. Also note there is little variability in minor factors for each installation type for these CMFs. The CMFs in Table 3, Table 4, and Table 6 , apply to rural, two-lane highways and the CMFs in Table 5 apply to rural, multilane highways. These CMFs are mainly distinguishable by their applicable crash type and crash severity. However, a few CMFs are applicable to specific geometric characteristics as noted in the final column of each table.

The specific characteristics listed in the final column help to identify where the treatment may be more effective. For example, Table 6 provides separate CMFs for AADT less than 3,200 and AADT greater than or equal to 3,200. While the difference is not statistically different, the average CMF for the higher volume is 0.70 versus 0.85 for the lower volume, indicating that shoulder and CLRS may be more effective on high-volume roadways. Comparing CMFs provides insights into which crash types, severities, and locations the treatment is more effective at mitigating.

Table 3. Sample CMF Clearinghouse CMFs for CLRS on rural, two-lane highways.

ID	Stars	CMF	L95	U95	Crash Type	Crash Severity	Jurisdiction	Min AADT	Max AADT	Specific Characteristic
3350	5	0.91	0.84	0.98	All	F & I	MN, PA, WA	574	20,784	—
3355	5	0.63	0.53	0.73	Head-on, Sideswipe	All	MN, PA, WA	574	20,784	—
3360	5	0.55	0.43	0.68	Head-on, Sideswipe	F & I	MN, PA, WA	574	20,784	—
3361	5	0.91	0.87	0.95	All	All	CA, CO, DE, MD, MN, OR, PA, WA	574	20,784	—
3362	5	0.88	0.83	0.94	All	F & I	CA, CO, DE, MD, MN, OR, PA, WA	574	20,784	—
3363	5	0.7	0.61	0.79	Head-on, Sideswipe	All	CA, CO, DE, MD, MN, OR, PA, WA	574	20,784	—
3375	5	0.53	0.34	0.72	Head-on, Sideswipe	All	MN, PA, WA	574	20,784	Horizontal Curves
3383	5	0.85	0.73	0.97	All	F & I	MN, PA, WA	574	20,784	Horizontal Tangents
3387	5	0.51	0.38	0.65	Head-on, Sideswipe	All	MN, PA, WA	574	20,784	Horizontal Tangents
3367	4	1.04	0.91	1.17	All	All	MN, PA, WA	574	20,784	Horizontal Curves
3371	4	0.94	0.78	1.10	All	F & I	MN, PA, WA	574	20,784	Horizontal Curves
3379	4	0.92	0.84	1.00	All	All	MN, PA, WA	574	20,784	Horizontal Tangents
5398	4	0.71	0.52	0.90	Other	All	KS	200	8,000	—
5400	4	0.81	0.53	1.08	ROR	All	KS	200	8,000	—
7244	4	0.73	0.72	0.73	Target	All	MI	—	—	—
7245	4	0.47	0.47	0.47	Target-Wet	All	MI	—	—	—
7246	4	0.99	0.98	0.99	Target-Winter	All	MI	—	—	—
7247	4	0.57	0.57	0.57	Target-Passing	All	MI	—	—	—
7248	4	0.71	0.71	0.72	Target-Impaired	All	MI	—	—	—
7250	4	0.68	0.68	0.68	Target	A Inj.	MI	—	—	—
7251	4	0.61	0.60	0.61	Target	B Inj.	MI	—	—	—
7252	4	0.72	0.72	0.72	Target	C Inj.	MI	—	—	—
7253	4	0.84	0.83	0.84	Target	PDO	MI	—	—	—
"–" Blank cells indicate no information was available.

Table 4. Sample CMF Clearinghouse CMFs for SRS on rural, two-lane highways.

ID	Stars	CMF	L95	U95	Crash Type	Crash Severity	Jurisdiction	Min AADT	Max AADT	Specific Characteristic
3442	5	0.84	0.68	1.00	ROR	All	MN, MO, PA	782	10,386	—
3454	5	0.64	0.45	0.83	ROR	F & I	MN, MO, PA	782	10,386	—
3394	4	0.67	0.43	0.91	ROR	F & I	MN, MO, PA	180	12,776	Edge Line (0 in. to 8 in.)
3408	4	0.57	0.29	0.86	ROR	F & I	MN, MO, PA	180	12,776	Edge Line (0 in. to 8in., 5 ft recovery area
3418	4	1.06	0.95	1.17	All	All	MN, MO, PA	782	10,386	—
3430	4	0.92	0.76	1.08	All	F & I	MN, MO, PA	782	10,386	—
3582	4	1.18	0.88	1.48	ROR, wet road	All	MN, MO, PA	782	10,386	—
3603	4	0.89	0.64	1.14	ROR, night	All	MN, MO, PA	782	10,386	—
3627	4	0.46	0.21	0.71	ROR	F & I	MN, MO, PA	180	12,776	5 ft Shoulder
3651	4	0.62	0.33	0.91	ROR	F & I	MN, MO, PA	180	12,776	9 in. to 20 in. offset from EL
7255	4	0.67	0.67	0.68	Target	All	MI	—	—	—
7256	4	0.44	0.44	0.45	Target-Wet	All	MI	—	—	—
7257	4	0.95	0.94	0.96	Target-Winter	All	MI	—	—	—
7258	4	0.64	0.64	0.65	Target-Passing	All	MI	—	—	—
7259	4	0.60	0.59	0.61	Target-Impaired	All	MI	—	—	—
7261	4	0.68	0.67	0.68	Target	A Inj.	MI	—	—	—
7262	4	0.46	0.46	0.47	Target	B Inj.	MI	—	—	—
7263	4	0.65	0.64	0.66	Target	C Inj.	MI	—	—	—
7264	4	0.72	0.71	0.72	Target	PDO	MI	—	—	—
"–" Blank cells indicate no information was available.

Table 5. Sample CMF Clearinghouse CMFs for SRS on rural, multilane highways.

ID	Stars	CMF	L95	U95	Crash Type	Crash Severity	Jurisdiction	Min AADT	Max AADT	Specific Characteristic
3414	5	1.18	1.03	1.33	All	All	MN, MO, PA	4,959	20,763	—
3438	5	1.40	1.16	1.64	ROR	All	MN, MO, PA	4,959	20,763	—
3450	4	0.97	0.71	1.23	ROR	F & I	MN, MO, PA	4,959	20,763	—
3426	4	0.90	0.70	1.10	All	F & I	MN, MO, PA	4,959	20,763	—
6649	4	0.76	0.65	0.87	All	All	FL	2,000	50,000	4 ft to 12 ft Shoulder
6650	4	0.64	0.50	0.79	All	F & I	FL	2,000	50,000	4 ft to 12 ft Shoulder
6653	4	0.61	0.41	0.82	All	All	FL	2,000	50,000	4 ft to 6 ft Shoulder
6654	4	0.57	0.30	0.83	All	F & I	FL	2,000	50,000	4 ft to 6 ft Shoulder
6655	4	0.79	0.67	0.92	All	All	FL	2,000	50,000	8 ft to 12 ft Shoulder
6653	4	0.66	0.49	0.83	All	F & I	FL	2,000	50,000	8 ft to 12 ft Shoulder
6665	4	0.61	0.49	0.72	All	All	FL	2,000	50,000	Widen Shoulder
6667	4	0.54	0.37	0.71	ROR	All	FL	2,000	50,000	Widen Shoulder
6669	4	0.35	0.23	0.47	All	All	FL	2,000	50,000	Widen Original 4 ft to 6 ft Shoulder
6671	4	0.81	0.62	1.00	All	All	FL	2,000	50,000	Widen Original 8 ft to 12 ft Shoulder
4780	4	0.76	0.63	0.89	All	F & SI	MO	—	—	Edge Line and Wider Marking
4781	4	0.74	0.67	0.81	All	F & I	MO	—	—	Edge Line and Wider Marking
4782	4	0.86	0.77	0.95	All	F & I	MO	—	—	Edge Line and Wider Marking on Urban
4787	4	0.75	0.51	0.99	All	F & I	MO	—	—	Shoulder and Wider Marking
"–" Blank cells indicate no information was available.

Table 6. Sample CMF Clearinghouse CMFs for CLRS and SRS on rural, two-lane highways.

ID	Stars	CMF	L95	U95	Crash Type	Crash Severity	Jurisdiction	Min AADT	Max AADT	Specific Characteristic
6850	5	0.80	0.75	0.85	All	All	KY, MO, PA	154	25,796	—
6851	5	0.77	0.70	0.84	All	F & I	KY, MO, PA	154	25,796	—
6852	5	0.74	0.66	0.82	ROR	All	KY, MO, PA	154	25,796	—
6853	5	0.63	0.47	0.80	Head-on	All	KY, MO, PA	154	25,796	—
6854	5	0.77	0.58	0.96	Sideswipe	All	KY, MO, PA	154	26,118	—
6973	5	0.85	0.68	1.03	ROR	All	KY, MO, PA	154	3,199	AADT < 3,200
6974	5	0.70	0.61	0.79	ROR	All	KY, MO, PA	3,200	26,118	AADT ≥ 3,200
4790	4	0.62	0.43	0.81	All	F & I	MO	—	—	Edge Line and Wider Marking
"—" Blank cells indicate no information was available.

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Page last modified on February 1, 2017

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Decision Support Guide for the Installation of Shoulder and Center Line Rumble Strips on Non-Freeways

Other Resources

Appendix A–Example CMF Tables