(a) Roads with safety edge treatments with lane widening

Road Name

Other treatments

Data of implementation

Segment length (miles)

AADT

(vehicles per day)

Lane widening

12 ft to 13 ft

Lane widening

12 ft to 14 ft

Mean (SD)

Before Mean (SD)

After Mean

(SD)

K-23 from Lane County

No

Yes

2010

1.02 (1.745)

826

(501)

884

(253)

K-23 to US 83/K 383 junction

No

Yes

2012

1.58

(2.32)

640

(253)

633

(281)

K 25 from Russell Spring

Yes

No

2012

1.67

(3.19)

200

(18)

234

(15)

(b) Roads with adding 2 ft paved shoulders with asphalt resurfacing and/or shoulder rumble strips

Other treatments

Data of implementation

Segment length (miles)

AADT

(vehicles per day)

Asphalt resurfacing

Shoulder rumble strips

Mean (SD)

Before

Mean (SD)

After

Mean (SD)

US-5 DK/MR Counties

Yes

No

2013

0.629

(1.388)

1.032

(230)

1.017

(224)

K-156

No

No

2014

1.195

(1.535)

1.718 (495)

1.140

(374)

US-56 Counsel Groove

Yes

No

2013

0.592 (1.339)

1.859

(179)

1.752

(113)

K-99 NCL of Alma

Yes

No

2013

0.4808 (0.883)

2.673

(2.049)

2.772

(2.242)

US-81

No

No

2013

0.540 (0.923)

3.759

(625)

3.971

(812)

K-2/K-42

No

Yes

2014

0.736 (1.029)

2.421

(91)

1.555

(30)

K-42 Sumner and Sedgwick Counties

No

Yes

2012

0.6131 (0.451)

3.091

(34)

3.481

(119)

US-81Sumner county

No

No

2011

0.628 (0.605)

4.296

(1.966)

4.979

(1.710)

K-196 Harvey county

No

Yes

2012

1.602 (0.940)

5.757 (4.556)

6.121

(4.790)

K-1 Comanche county

Yes

Yes

2013

1.336 (1.275)

713

(57)

660

(55)

K-130

No

No

2013

0.339 (0.510)

1.230

(141)

1.154

(159)

US-160

No

Yes

2013

1.483 (1.842)

1.192

(743)

1.203

(671)