Evaluation of The TAPCO Sequential Dynamic Curve Warning System

APPENDIX B. SITE DATA TABLES AND FIGURES

In this appendix are the data tables and figures for each site. Each curve has three tables and two figures representing the data collected during the "before" and "1 month after" periods. The first two tables are the speed statistics collected at the PC and CC. The statistics compare the before data to 1 month after, with a negative change representing a reduction. The fraction of vehicles exceeding the speed limit change shows a percentage change in the vehicles exceeding the speed limit between the data collection periods. Also in those tables are speed statistics using the tracking methodology described in the literature review. The third table contains the statistics collected from the tracking methodology and shows the speed reductions that occurred from upstream to the respective point in the curve.

The figures are graphical representations of the data shown in the tables. One figure shows the vehicles mean and 85th percentile speeds at the data collection points, while the other figure shows the change in vehicles exceeding the speed limit at the data collection points.

Iowa Highway 144

Table 8. Results for Iowa – Hwy 144 at PC.
	Before	1 Month	Change
ADT	1435	1408	-27
Sample	717	708
Upstream Mean Speed	60.0	58.9	-1.1
Mean Speed	50.7	49.2	-1.5
Standard Deviation	5.2	5.8
85th Percentile Speed	56	55	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.61	0.49	-19.7%
Percentage of Vehicles 10+ Over Limit	0.24	0.16	-33.3%
Percentage of Vehicles 15+ Over Limit	0.04	0.04	0.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.01	0.0%
Tracking Data
Sample	705	700
Upstream Mean Speed	60.0	59.1	-0.9
Mean Speed	50.7	49.3	-1.4
Standard Deviation	5.2	5.5
85th Percentile Speed	56	55	-1

Table 9. Results for Iowa – Hwy 144 at CC.
	Before	1 Month	Change
ADT	1468	1428	-40
Sample	718	713
Upstream Mean Speed	60.0	58.9	-1.1
Mean Speed	48	45.9	-2.1
Standard Deviation	6.2	6.3
85th Percentile Speed	53	51	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.42	0.26	-38.1%
Percentage of Vehicles 10+ Over Limit	0.12	0.05	-58.3%
Percentage of Vehicles 15+ Over Limit	0.01	0.01	0.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.00	0.0%
Tracking Data
Sample	705	700
Upstream Mean Speed	60.0	59.1	-0.9
Mean Speed	48.3	46.0	-2.3
Standard Deviation	5.6	6
85th Percentile Speed	53	51	-2

Table 10. Speed Reduction for Iowa – Hwy 144.
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	9	9.7	0.5
Mean Speed Reduction Upstream to CC	11.7	13.0	1.3
Mean Speed Reduction PC to CC	2.5	3.3	0.8
85th Percentile Speed Reduction Upstream to PC	14	15	1
85th Percentile Speed Reduction Upstream to CC	17	18	1
85th Percentile Speed Reduction PC to CC	5	5	0

Iowa (Hwy 144)

an image that shows Iowa Highway 144 curve warning arrow with 45 mile per hour curve advisory speed Graph: Iowa Highway 144 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (45 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 45. Graph. Impact on vehicle speed – Iowa Hwy 144.

Map: Location of sign for southbound traffic on Iowa Highway 144 Bar chart: Change in upstream percentile vehicle speeds on Iowa Highway 144 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Iowa Highway 144 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Iowa Highway 144 at 1 month

Figure 46. Map and graphs. Location and change in percentile vehicle speed – Iowa Hwy 144.

Missouri Highway 221

Table 11. Results for Missouri – Hwy 221 at PC
	Before	1 Month	Change
ADT	5277	5158	-119
Sample	2566	2523
Upstream Mean Speed	52.2	52.8	0.6
Mean Speed	51.7	50.2	-1.5
Standard Deviation	4.7	4.8
85th Percentile Speed	56	55	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.94	0.88	-6.4%
Percentage of Vehicles 10+ Over Limit	0.70	0.58	-17.1%
Percentage of Vehicles 15+ Over Limit	0.25	0.17	-32.0%
Percentage of Vehicles 20+ Over Limit	0.04	0.02	-50.0%
Tracking Data
Sample	2501	2459
Upstream Mean Speed	52.2	52.8	0.6
Mean Speed	51.7	50.2	-1.5
Standard Deviation	4.7	4.8
85th Percentile Speed	57	55	-2

Table 12. Results for Missouri – Hwy 221 at CC.
	Before	1 Month	Change
ADT	5274	5169	-105
Sample	2559	2522
Upstream Mean Speed	52.2	52.8	0.6
Mean Speed	48.3	48.6	0.3
Standard Deviation	4.4	4.6
85th Percentile Speed	53	53	0
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.82	0.82	0.0%
Percentage of Vehicles 10+ Over Limit	0.38	0.42	10.5%
Percentage of Vehicles 15+ Over Limit	0.07	0.09	28.6%
Percentage of Vehicles 20+ Over Limit	0.01	0.01	0.0%
Tracking Data
Sample	2501	2459
Upstream Mean Speed	52.2	52.8	0.6
Mean Speed	48.3	48.6	0.3
Standard Deviation	4.4	4.6
85th Percentile Speed	53	53	0

Table 13. Speed reduction for Missouri – Hwy 221.
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	0.6	2.6	2
Mean Speed Reduction Upstream to CC	3.9	4.3	0.4
Mean Speed Reduction PC to CC	3.4	1.7	-1.7
85th Percentile Speed Reduction Upstream to PC	3	6	3
85th Percentile Speed Reduction Upstream to CC	7	8	1
85th Percentile Speed Reduction PC to CC	5	3	-2

Missouri (Hwy 221)

Image - Missouri Highway 221 curve site
Graph: Missouri Highway 221 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (40 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 47. Graph. Impact on vehicle speed – Missouri Hwy 221.

Map - Location of sign for northbound traffic on Missouri Highway 221 Bar chart: Change in upstream percentile vehicle speeds on Missouri Highway 221 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Missouri Highway 221 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Missouri Highway 221 at 1 month

Figure 48. Map and graphs. Location and change in percentile vehicle speed – Missouri Hwy 221.

Washington SR 7

Table 14. Results for Washington – SR 7 at PC.
	Before	1 Month	Change
ADT	1408	1413	5
Sample	763	766
Upstream Mean Speed	42.5	40.5	-2.0
Mean Speed	33.1	30.3	-2.8
Standard Deviation	4.7	4.6
85th Percentile Speed	33	30	-3
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.96	0.89	-7.3%
Percentage of Vehicles 10+ Over Limit	0.80	0.56	-30.0%
Percentage of Vehicles 15+ Over Limit	0.37	0.18	-51.4%
Percentage of Vehicles 20+ Over Limit	0.09	0.02	-77.8%
Sample	716	733
Tracking Data
Upstream Mean Speed	42.6	40.8	-1.8
Mean Speed	33.3	30.5	-2.8
Standard Deviation	4.6	4.4
85th Percentile Speed	38	35	-3

Table 15. Results for Washington – SR 7 at CC.
	Before	1 Month	Change
ADT	1420	1444	24
Sample	750	770
Upstream Mean Speed	42.5	40.5	-2.0
Mean Speed	27.2	25.8	-1.4
Standard Deviation	2.9	3.3
85th Percentile Speed	30	29	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.84	0.68	-19.0%
Percentage of Vehicles 10+ Over Limit	0.20	0.11	-45.0%
Percentage of Vehicles 15+ Over Limit	0.01	0.01	0.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.00	0.0%
Tracking Data
Sample	716	733
Upstream Mean Speed	42.6	40.8	-1.8
Mean Speed	27.2	26.0	-1.2
Standard Deviation	2.8	3.1
85th Percentile Speed	30	29	-1

Table 16. Speed reduction for Washington – SR 7.
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	9.3	10.3	1
Mean Speed Reduction Upstream to CC	15.4	14.8	-0.6
Mean Speed Reduction PC to CC	6.1	4.5	-1.6
85th Percentile Speed Reduction Upstream to PC	14	15.2	1.2
85th Percentile Speed Reduction Upstream to CC	20	21	1
85th Percentile Speed Reduction PC to CC	9	7	-2

Washington (SR 7)

Graph - Washington State Route 7 impact on mean and 85th percentile speeds for upstream (50 mile per hour speed limit), point of curvature (20 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 49. Graph. Impact on vehicle speed – Washington SR 7.

Washington (SR 7)

Map: Location of sign for southbound traffic on Washington State Route 7 Bar chart: Change in upstream percentile vehicle speeds on Washington State Route 7 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Washington State Route 7 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Washington State Route 7 at 1 month

Figure 50. Map and graphs. Location and change in percentile vehicle speed – Washington SR 7.

Washington SR 9

Table 17. Results for Washington – SR 9 at PC.
	Before	1 Month	Change
ADT	5533	6212	679
Sample	2702	3062
Upstream Mean Speed	46.9	48.7	1.8
Mean Speed	41	39.6	-1.4
Standard Deviation	5.0	5.0
85th Percentile Speed	46	45.0	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.23	0.16	-30.4%
Percentage of Vehicles 10+ Over Limit	0.04	0.02	-50.0%
Percentage of Vehicles 15+ Over Limit	0.01	0.00	-100.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.00	0.0%
Tracking Data
Sample	2598	2957
Upstream Mean Speed	47.1	48.8	1.7
Mean Speed	41.1	39.7	-1.4
Standard Deviation	4.9	4.9
85th Percentile Speed	46	44	-2

Table 18. Results for Washington – SR 9 at CC.
	Before	1 Month	Change
ADT	5523	6227	704
Sample	2688	3081
Upstream Mean Speed	46.9	48.7	1.8
Mean Speed	40.2	39.3	-0.9
Standard Deviation	5.0	5.0
85th Percentile Speed	45	44	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.19	0.14	-26.3%
Percentage of Vehicles 10+ Over Limit	0.03	0.02	-33.3%
Percentage of Vehicles 15+ Over Limit	0.00	0.00	0.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.00	0.0%
Tracking Data
Sample	2598	2957
Upstream Mean Speed	47.1	48.8	1.7
Mean Speed	40.3	39.3	-1
Standard Deviation	5.0	4.9
85th Percentile Speed	45	44	-1

Table 19. Speed reduction for Washington – SR 9
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	6.0	9.1	3.1
Mean Speed Reduction Upstream to CC	6.8	9.5	2.7
Mean Speed Reduction PC to CC	0.8	0.4	-0.4
85th Percentile Speed Reduction Upstream to PC	9	13	4
85th Percentile Speed Reduction Upstream to CC	10	13	3
85th Percentile Speed Reduction PC to CC	2	1	-1

Washington (SR 9)

Image - Washington State Route 9 curve site
Graph: Washington State Route 9 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (40 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 51. Graph. Impact on vehicle speed – Washington SR 9

Washington (SR 9)

Map: Location of sign for southbound traffic on Washington State Route 9 Bar chart: Change in upstream percentile vehicle speeds on Washington State Route 9 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Washington State Route 9 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Washington State Route 9 at 1 month

Figure 52. Map and graphs. Location and change in percentile vehicle speed – Washington SR 9.

Washington SR 203

Table 20. Results for Washington – SR 203 at PC
	Before	1 Month	Change
ADT	10088	10761	673
Sample	4901	5190
Upstream Mean Speed	53.8	54.2	0.4
Mean Speed	53.5	51.5	-2.0
Standard Deviation	5.0	4.5
85th Percentile Speed	58	56	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.96	0.94	-2.1%
Percentage of Vehicles 10+ Over Limit	0.83	0.71	-14.5%
Percentage of Vehicles 15+ Over Limit	0.43	0.23	-46.5%
Percentage of Vehicles 20+ Over Limit	0.08	0.03	-62.5%
Tracking Data
Sample	4637	4902
Upstream Mean Speed	54.1	54.4	0.3
Mean Speed	53.6	51.6	-2
Standard Deviation	4.7	4.5
85th Percentile Speed	58	56	-2

Table 21. Results for Washington – SR 203 at CC
	Before	1 Month	Change
ADT	10120	10756	636
Sample	4921	5148
Upstream Mean Speed	53.8	54.2	0.4
Mean Speed	51.6	51.5	-0.1
Standard Deviation	4.6	4.6
85th Percentile Speed	56	56	0
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.94	0.94	0.0%
Percentage of Vehicles 10+ Over Limit	0.72	0.70	-2.8%
Percentage of Vehicles 15+ Over Limit	0.25	0.24	-4.0%
Percentage of Vehicles 20+ Over Limit	0.03	0.03	0.0%
Tracking Data
Sample	4637	4902
Upstream Mean Speed	54.1	54.4	0.3
Mean Speed	51.8	51.6	-0.2
Standard Deviation	4.5	4.6
85th Percentile Speed	56	56	0

Table 22. Speed reduction for Washington – SR 203.
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	0.5	2.8	2.3
Mean Speed Reduction Upstream to CC	2.4	2.8	0.4
Mean Speed Reduction PC to CC	1.8	0	-1.8
85th Percentile Speed Reduction Upstream to PC	3	6	3
85th Percentile Speed Reduction Upstream to CC	6	7	1
85th Percentile Speed Reduction PC to CC	3	2	-1

Washington (SR 203)

Image: Washington State Route 203 curve site Graph: Washington State Route 203 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (no curve advisory speed), and center of curve before implementation and 1 month after

Figure 53. Graph Impact on vehicle speed – Washington SR 203.

Washington (SR 203)

Map: Location of sign for southbound traffic on Washington State Route 203 Bar chart: Change in upstream percentile vehicle speeds on Washington State Route 203 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Washington State Route 203 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Washington State Route 203 at 1 month

Figure 54. Map and graphs. Location and change in percentile vehicle speed – Washington SR 203.

Wisconsin Highway 20

Table 23. Results for Wisconsin – Hwy 20 at PC
	Before	1 Month	Change
ADT	3583	3250	-333
Sample	1692	1556
Upstream Mean Speed	53.7	55.2	1.5
Mean Speed	39.6	37.8	-1.8
Standard Deviation	7.6	7.1
85th Percentile Speed	47	45	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.77	0.70	-9.1%
Percentage of Vehicles 10+ Over Limit	0.58	0.47	-19.0%
Percentage of Vehicles 15+ Over Limit	0.27	0.16	-40.7%
Percentage of Vehicles 20+ Over Limit	0.07	0.03	-57.1%
Tracking Data
Sample	1318	1251
Upstream Mean Speed	54.1	55.7	1.6
Mean Speed	42.1	40.1	-2
Standard Deviation	5.7	5.4
85th Percentile Speed	48	45	-3

Table 24. Results for Wisconsin – Hwy 20 at CC
	Before	1 Month	Change
ADT	3128	2823	-305
Sample	1456	1350
Upstream Mean Speed	53.7	55.2	1.5
Mean Speed	37.4	35.6	-1.8
Standard Deviation	4.8	4.6
85th Percentile Speed	42	40	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.77	0.63	-18.2%
Percentage of Vehicles 10+ Over Limit	0.33	0.18	-45.5%
Percentage of Vehicles 15+ Over Limit	0.06	0.02	-66.7%
Percentage of Vehicles 20+ Over Limit	0.01	0.00	-100.0%
Tracking Data
Sample	1318	1251
Upstream Mean Speed	54.1	55.7	1.6
Mean Speed	37.8	36.1	-1.7
Standard Deviation	4.4	4.1
85th Percentile Speed	42	40	-2

Table 25. Speed reduction for Wisconsin – Hwy 20
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	12.0	15.6	3.6
Mean Speed Reduction Upstream to CC	16.2	19.5	3.3
Mean Speed Reduction PC to CC	4.3	4.0	-0.3
85th Percentile Speed Reduction Upstream to PC	18	20	2
85th Percentile Speed Reduction Upstream to CC	23	25	2
85th Percentile Speed Reduction PC to CC	8	7	-1

Wisconsin (Hwy 20)

Image: Wisconsin Highway 20 curve site Graph: Wisconsin Highway 20 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (30 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 55. Graph. Impact on vehicle speed – Wisconsin Hwy 20.

Wisconsin (Hwy 20)

Map: Location of sign for eastbound traffic on Wisconsin Highway 20 Bar chart: Change in upstream percentile vehicle speeds on Wisconsin Highway 20 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Wisconsin Highway 20 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Wisconsin Highway 20 at 1 month

Figure 56. Map and graphs. Location and change in percentile vehicle speed – Wisconsin Hwy 20.

Wisconsin Highway 67

Table 26. Results for Wisconsini – Hwy 67 at PC.
	Before	1 Month	Change
ADT	3494	4018	524
Sample	1726	1992
Upstream Mean Speed	50.0	48.9	-1.1
Mean Speed	46.1	44.5	-1.6
Standard Deviation	5.9	6
85th Percentile Speed	52	51	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.99	0.99	0.0%
Percentage of Vehicles 10+ Over Limit	0.97	0.94	-3.1%
Percentage of Vehicles 15+ Over Limit	0.87	0.80	-8.0%
Percentage of Vehicles 20+ Over Limit	0.65	0.51	-21.5%
Tracking Data
Sample	1668	1931
Upstream Mean Speed	50.0	48.9	-1.1
Mean Speed	46.1	44.5	-1.6
Standard Deviation	5.8	6.0
85th Percentile Speed	52	51	-1

Table 27. Results for Wisconsin – Hwy 67 at CC.
	Before	1 Month	Change
ADT	3496	4004	508
Sample	1713	1979
Upstream Mean Speed	50.0	48.9	-1.1
Mean Speed	39.7	37.9	-1.8
Standard Deviation	5.0	5.0
85th Percentile Speed	45	43	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.97	0.95	-2.1%
Percentage of Vehicles 10+ Over Limit	0.86	0.76	-11.6%
Percentage of Vehicles 15+ Over Limit	0.53	0.38	-28.3%
Percentage of Vehicles 20+ Over Limit	0.15	0.08	-46.7%
Tracking Data
Sample	1668	1931
Upstream Mean Speed	50.0	48.9	-1.1
Mean Speed	39.7	37.9	-1.8
Standard Deviation	5.0	5.0
85th Percentile Speed	45	43	-2

Table 28. Speed Reduction for Wisconsin – Hwy 67.
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	3.9	4.40	0.5
Mean Speed Reduction Upstream to CC	10.2	11.0	0.8
Mean Speed Reduction PC to CC	6.4	6.6	0.2
85th Percentile Speed Reduction Upstream to PC	11	13	2
85th Percentile Speed Reduction Upstream to CC	19	20	1
85th Percentile Speed Reduction PC to CC	9	9	0

Wisconsin (Hwy 67)

Image: Wisconsin Highway 67 curve site Graph: Wisconsin Highway 67 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (25 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 57. Graph. Impact on vehicle speed – Wisconsin Hwy 67

Wisconsin (Hwy 67)

Map: Location of sign for southbound traffic on Wisconsin Highway 67 Bar chart: Change in upstream percentile vehicle speeds on Wisconsin Highway 67 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Wisconsin Highway 67 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Wisconsin Highway 67 at 1 month

Figure 58. Map and graphs. Location and change in percentile vehicle speed - Wisconsin.

Wisconsin Highway 213

Table 29. Results for Wisconsin – Hwy 213 at PC.
	Before	1 Month	Change
ADT	2369	2249	-120
Sample	1156	1119
Upstream Mean Speed	58.8	59.8	1.0
Mean Speed	55.3	54.6	-0.7
Standard Deviation	7	6.6
85th Percentile Speed	61	61	0
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.63	0.57	-9.5%
Percentage of Vehicles 10+ Over Limit	0.28	0.21	-25.0%
Percentage of Vehicles 15+ Over Limit	0.03	0.03	0.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.00	0.0%
Tracking Data
Sample	1134	1098
Upstream Mean Speed	58.9	59.9	1
Mean Speed	55.5	54.8	-0.7
Standard Deviation	6.5	6.2
85th Percentile Speed	61	61	0

Table 30. Results for Wisconsin – Hwy 213 at CC.
	Before	1 Month	Change
ADT	2552	2428	-124
Sample	1220	1193
Upstream Mean Speed	58.8	59.8	1.0
Mean Speed	53.2	52.2	-1.0
Standard Deviation	9.7	9.8
85th Percentile Speed	61	60	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.59	0.52	-11.9%
Percentage of Vehicles 10+ Over Limit	0.25	0.20	-20.0%
Percentage of Vehicles 15+ Over Limit	0.02	0.03	50.0%
Percentage of Vehicles 20+ Over Limit	0.00	0.00	0.0%
Tracking Data
Sample	1134	1098
Upstream Mean Speed	58.9	59.9	1
Mean Speed	54.7	54.0	-0.7
Standard Deviation	7.7	7.5
85th Percentile Speed	61	61	0

Table 31. Speed reduction for Wisconsin – Hwy 213
	Before	1 Month	Change
Mean Speed Reduction Upstream to PC	3.4	5.1	1.7
Mean Speed Reduction Upstream to CC	4.2	5.9	1.7
Mean Speed Reduction PC to CC	0.8	0.8	0
85th Percentile Speed Reduction Upstream to PC	9	10	1
85th Percentile Speed Reduction Upstream to CC	10	11.5	1.5
85th Percentile Speed Reduction PC to CC	2	2	0

Wisconsin (Hwy 213)

Image - Wisconsin Highway 213 curve site
Graph: Wisconsin Highway 213 impact on mean and 85th percentile speeds for upstream (55 mile per hour speed limit), point of curvature (50 mile per hour advisory speed), and center of curve before implementation and 1 month after

Figure 59. Graph. Impact on vehicle speed – Wisconsin Hwy 213.

Wisconsin (Hwy 213)

Map: Location of sign for eastbound traffic on Wisconsin Highway 213 Bar chart: Change in upstream percentile vehicle speeds on Wisconsin Highway 213 at 1 month Bar chart: Change in point of curvature percentile vehicle speeds on Wisconsin Highway 213 at 1 month Bar chart: Change in center of curvature percentile vehicle speeds on Wisconsin Highway 213 at 1 month

Figure 60. Map and graphs. Location and change in percentile vehicle speed – Wisconsin Hwy 213.

Texas FM 109

Table 32. Results for Texas – FM 109 at PC.
	Before	1 Month	Change
ADT	2187	2031	-156
Sample	1036	954
Upstream Mean Speed	58.2	59.6	1.4
Mean Speed	46.6	45.8	-0.8
Standard Deviation	5.7	5.4
85th Percentile Speed	52	51	-1
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.92	0.90	-2.2%
Percentage of Vehicles 10+ Over Limit	0.68	0.62	-8.8%
Percentage of Vehicles 15+ Over Limit	0.30	0.23	-23.3%
Percentage of Vehicles 20+ Over Limit	0.07	0.04	0.0%

Table 33. Results for Texas – FM 109 at CC.
	Before	1 Month	Change
ADT	2129	1991	-138
Sample	1017	938
Upstream Mean Speed	58.2	59.6	1.4
Mean Speed	45.2	43.8	-1.4
Standard Deviation	5.2	4.7
85th Percentile Speed	50	48	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.90	0.85	-5.7%
Percentage of Vehicles 10+ Over Limit	0.60	0.43	-27.7%
Percentage of Vehicles 15+ Over Limit	0.18	0.09	-51.4%
Percentage of Vehicles 20+ Over Limit	0.02	0.01	0.0%

Texas (FM 109)

Figure 61. Graph. Impact on vehicle speed – Texas FM 109

Texas (FM 109)

Figure 62. Map and graphs. Location and change in percentile vehicle speed – Texas FM 109.

Texas FM 407

Table 34. Results for Texas – FM 407 at PC
	Before	1 Month	Change
ADT	2480	2883	403
Sample	856	1443
Upstream Mean Speed	61.3	60.1	-1.2
Mean Speed	51.5	49.7	-1.8
Standard Deviation	5.6	5.3
85th Percentile Speed	57	55	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.89	0.83	-6.7%
Percentage of Vehicles 10+ Over Limit	0.67	0.53	-20.9%
Percentage of Vehicles 15+ Over Limit	0.31	0.18	-41.9%
Percentage of Vehicles 20+ Over Limit	0.06	0.03	0.0%
*Note: Only 18 hours of data collected because of puncture in the tube

Table 35. Results for Texas – FM 407 at CC.
	Before	1 Month	Change
ADT	2238	2885	647
Sample	579	1446
Upstream Mean Speed	61.3	60.1	-1.2
Mean Speed	47.3	46.2	-1.1
Standard Deviation	6.3	5.6
85th Percentile Speed	53	51	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.73	0.67	-8.2%
Percentage of Vehicles 10+ Over Limit	0.37	0.26	-29.7%
Percentage of Vehicles 15+ Over Limit	0.10	0.04	-60.0%
Percentage of Vehicles 20+ Over Limit	0.01	0.01	0.0%
*Note: Only 16 hours of data collected because of puncture in the tube

Texas (FM 407)

Figure 63. Graph. Impact on vehicle speed – Texas FM 407.

Texas (FM 407)

Figure 64. Map and graphs. Location and change in percentile vehicle speed – Texas FM 407.

Texas FM 530

Table 36. Results for Texas – FM 530 at PC.
	Before	1 Month	Change
ADT	675	418	-257
Sample	71	200
Upstream Mean Speed	62.1	60.0	-2.1
Mean Speed	47.1	46.2	-0.9
Standard Deviation	9.3	6.3
85th Percentile Speed	55	53	-2
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.86	0.88	2.3%
Percentage of Vehicles 10+ Over Limit	0.77	0.62	-19.5%
Percentage of Vehicles 15+ Over Limit	0.38	0.33	-13.2%
Percentage of Vehicles 20+ Over Limit	0.20	0.09	0.0%
*Note: The “before” count had many unknown counts, leading to fewer counts for the 24-hour period

Table 37. Results for Texas – FM 530 at CC.
	Before	1 Month	Change
ADT	488	430	-58
Sample	237	204
Upstream Mean Speed	62.1	60.0	-2.1
Mean Speed	43.2	41.2	-2.0
Standard Deviation	6.1	5.2
85th Percentile Speed	48.6	46	-2.6
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.79	0.63	-20.3%
Percentage of Vehicles 10+ Over Limit	0.44	0.28	-36.4%
Percentage of Vehicles 15+ Over Limit	0.11	0.04	-63.6%
Percentage of Vehicles 20+ Over Limit	0.02	0.00	0.0%

Texas (FM 530)

Figure 65. Graph. Impact on vehicle speed – Texas FM 530

Texas (FM 530)

Figure 66. Map and graphs. Location and change in percentile vehicle speed – Texas FM 530.

Texas FM 1148

Table 38. Results for Texas – FM 1148 at PC.
	Before	1 Month	Change
ADT	3549	3742	193
Sample	1746	1832
Upstream Mean Speed	59.3	58.9	-0.4
Mean Speed	51.9	49.5	-2.4
Standard Deviation	5	4.8
85th Percentile Speed	57	54	-3
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.94	0.86	-8.5%
Percentage of Vehicles 10+ Over Limit	0.70	0.51	-27.1%
Percentage of Vehicles 15+ Over Limit	0.28	0.13	-53.6%
Percentage of Vehicles 20+ Over Limit	0.06	0.02	0.0%

Table 39. Results for Texas – FM 1148 at CC.
	Before	1 Month	Change
ADT	3538	3708	170
Sample	1748	1831
Upstream Mean Speed	59.3	58.9	-0.4
Mean Speed	48.5	48.4	-0.1
Standard Deviation	4.5	4.9
85th Percentile Speed	53	53	0
Fraction of vehicles exceeding advisory speed
Percentage of Vehicles 5+ Over Limit	0.83	0.79	-4.8%
Percentage of Vehicles 10+ Over Limit	0.40	0.41	2.5%
Percentage of Vehicles 15+ Over Limit	0.08	0.08	0.0%
Percentage of Vehicles 20+ Over Limit	0.01	0.01	0.0%

Texas (FM 1148)

Figure 67. Graph. Impact on vehicle speed – Texas FM 1148

Texas (FM 1148)

Figure 68. Map and graphs. Location and change in percentile vehicle speed – Texas FM 1148