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


            
            In This Section
        Rumble Strips and Rumble Stripes
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                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 Characteristic3350
			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 Curves3383
			5
			0.85
			0.73
			0.97
			All
			F & I
			MN, PA, WA
			574
			20,784
			Horizontal Tangents3387
			5
			0.51
			0.38
			0.65
			Head-on, Sideswipe
			All
			MN, PA, WA
			574
			20,784
			Horizontal Tangents3367
			4
			1.04
			0.91
			1.17
			All
			All
			MN, PA, WA
			574
			20,784
			Horizontal Curves3371
			4
			0.94
			0.78
			1.10
			All
			F & I
			MN, PA, WA
			574
			20,784
			Horizontal Curves3379
			4
			0.92
			0.84
			1.00
			All
			All
			MN, PA, WA
			574
			20,784
			Horizontal Tangents5398
			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 Characteristic3442
			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 area3418
			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 Shoulder3651
			4
			0.62
			0.33
			0.91
			ROR
			F & I
			MN, MO, PA
			180
			12,776
			9 in. to 20 in. offset from EL7255
			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 Characteristic3414
			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 Shoulder6650
			4
			0.64
			0.50
			0.79
			All
			F & I
			FL
			2,000
			50,000
			4 ft to 12 ft Shoulder6653
			4
			0.61
			0.41
			0.82
			All
			All
			FL
			2,000
			50,000
			4 ft to 6 ft Shoulder6654
			4
			0.57
			0.30
			0.83
			All
			F & I
			FL
			2,000
			50,000
			4 ft to 6 ft Shoulder6655
			4
			0.79
			0.67
			0.92
			All
			All
			FL
			2,000
			50,000
			8 ft to 12 ft Shoulder6653
			4
			0.66
			0.49
			0.83
			All
			F & I
			FL
			2,000
			50,000
			8 ft to 12 ft Shoulder6665
			4
			0.61
			0.49
			0.72
			All
			All
			FL
			2,000
			50,000
			Widen Shoulder6667
			4
			0.54
			0.37
			0.71
			ROR
			All
			FL
			2,000
			50,000
			Widen Shoulder6669
			4
			0.35
			0.23
			0.47
			All
			All
			FL
			2,000
			50,000
			Widen Original 4 ft to 6 ft Shoulder6671
			4
			0.81
			0.62
			1.00
			All
			All
			FL
			2,000
			50,000
			Widen Original 8 ft to 12 ft Shoulder4780
			4
			0.76
			0.63
			0.89
			All
			F & SI
			MO
			—
			—
			Edge Line and Wider Marking4781
			4
			0.74
			0.67
			0.81
			All
			F & I
			MO
			—
			—
			Edge Line and Wider Marking4782
			4
			0.86
			0.77
			0.95
			All
			F & I
			MO
			—
			—
			Edge Line and Wider Marking on Urban4787
			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 Characteristic6850
			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 < 3,2006974
			5
			0.70
			0.61
			0.79
			ROR
			All
			KY, MO, PA
			3,200
			26,118
			AADT ≥ 3,2004790
			4
			0.62
			0.43
			0.81
			All
			F & I
			MO
			—
			—
			Edge Line and Wider Marking"—" Blank cells indicate no information was available.
      
  Book traversal links for APPENDIX A – EXAMPLE CMF TABLES
      ‹ OTHER RESOURCES
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                    APPENDIX B – DETAILED EXAMPLE APPLICATIONS ›
                
                Book:Decision Support Guide for the Installation of Shoulder and Center Line Rumble Strips on Non-Freeways
              INTRODUCTION
                RUMBLE STRIPS AND SAFETY MANAGEMENT
                SPECIAL CONSIDERATIONS
                OVERVIEW OF CURRENT AND SUCCESSFUL INSTALLATION PRACTICES
                MODEL DECISION-SUPPORT FRAMEWORK FOR RUMBLE STRIP INSTALLATION
                CASE STUDIES
                OTHER RESOURCES
                APPENDIX A – EXAMPLE CMF TABLES
                APPENDIX B – DETAILED EXAMPLE APPLICATIONS
                REFERENCES U.S. DEPARTMENT OF TRANSPORTATION

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