County, City

Location

Treatment

Direction

Before Study

After Study

Statistical significance of t-test for 85th percentile speed at 95% confidence interval

85th Percentile Speed, X1 (mph)

85th Percentile Speed, X2 (mph)

Atchison

US-59 @ WCL

Colored Pavement

East

54.8

55.3

No (Speed Increased)

Clark, Minneola

US-283, 0.125 miles South of S.C.L

Colored Pavement

North

57.4

47.7

Yes

US-283, 0.125 miles North of N.C.L

Colored Pavement

South

51.8

52.9

No (Speed Increased)

Cowley, Winfield

US-77 @ 33rd St

Solar Speed Display

North

56.8

56.4

No

Marion, Peabody

US-50 @ W.C.L

Solar Speed Display

East

58.5

56.3

Yes

US-50 @ E.C.L

Solar Speed Display

West

63.2

54.1

Yes

Pottawatomie, St. George

US-24 @ Flush Road

Mobile Speed Trailer

West

73.2

71.1

Yes

Sedgwick, Goddard

US-54 & 215th St

Mobile Speed Trailer

East

69.1

58.8

Yes

Douglas

US-24@ N 2000/E 1400 Strs. Midland Jct

Optical Speed Bars

East

45.2

45.2

No

West

47.6

46.3

No

East-West

46.8

45.9

No

Wallace

K-27, North curve approach

Optical Speed Bars

Combined NB/SB

52.5

59.7

No (Speed Increased)

K-27, South curve approach

Optical Speed Bars

Combined NB/SB

55.3

56.1

No (Speed Increased)