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FHWA Highway Safety Programs

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.