(a) Individual CMFs estimated for safety edge treatment

All crashes

Lane-departure crashes

All

Fatal and injury

All

Fatal and injury

^aCombined CMF (CMF_CT)

0.51

0.6

0.65

0.53

^bCMF for increasing lane width (CMF₂)

1.101*

1.21*

1.331*

1.782*

1.241*

1.542*

1.351*

1.832*

Method 1: ^cCMF for safety edge (CMF₁)

0.463*

0.424*

0.453*

0.344*

0.523*

0.424*

0.393*

0.294*

Method 2: ^cCMF for safety edge (CMF₁)

0.533*

0.564*

0.703*

0.834*

0.733*

0.834*

0.623*

0.754*

Method 3: ^cCMF for safety edge (CMF₁)

0.783*

0.684*

0.553*

0.414*

0.553*

0.444*

0.593*

0.444*

(b) Individual CMFs estimated for adding 2 ft paved shoulders

All crashes

Lane-departure crashes

All

Fatal and injury

All

Fatal and injury

^aCombined CMF (CMF_CT)

0.96

0.69

0.55

0.53

^bCMF for rumbl strips (CMF₂)

0.75

0.52

0.77

0.54

^b*CMF for resurfacing road (CMF₂)

0.40

0.39

1.27

1.36

Method 1: ^cCMF for adding 2 ft paved shoulders (CMF₁)

3.20

3.40

0.56

0.72

Method 2: ^cCMF for for adding 2 ft paved shoulders (CMF₁)

1.42

1.06

0.59

0.65

Method 3: ^cCMF for adding 2 ft paved shoulders (CMF₁)

1.17

1.14

0.33

0.36