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APPENDIX F
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson & Associates, Inc. Page F-1 Appendix F Histograms of Speed Profile Data at 10 Sites This appendix provides a series of 14 exhibits, one for each intersection approach discussed in the speed profile analysis. In each exhibit, speed data are summarized in the form of a histogram for each approach location (A through D) and data collection period (before and after) combination. The exhibits generally consist of a set of 2 x 4 panelsâ2 columns representing before and after data collection periods; 4 rows representing Locations A through D. In some instances, fewer locations are available (e.g., Exhibits F-3 and F-13); in other instances, a histogram may be further subdivided by approach lane (e.g., Exhibit F-9). When an individual panel is empty (e.g., Exhibit F-10), either no speed data were available that match the time window or no data were originally collected at that location in that lane. The physical layout of each exhibit allows for direct before-after comparison, as well as the comparison of speed profiles along an approach from Location D to Location A (i.e., toward the intersection) for each data collection period. The inset in each histogram provides basic descriptive statistics (number of vehicles; minimum, mean, and maximum speeds; and speed standard deviation). A vertical dashed gray line is drawn at the posted speed limit of each approach. The curve of a normal distribution (blue dashed line) with sample mean speed and sample standard deviation speed is superimposed on each histogram. The speed histograms illustrate the following features of the data: ⢠For a given time period, the reduction in mean speeds along the approach ⢠For a given location, the shape of the speed data distribution: approximately normal; skewed in one direction; long tails in one or both directions; or bimodal ⢠Changes in the dispersion of the speed measurements across data collection periods Bimodal data, represented by two distinct peaks on a histogram, is indicative of two driver populationsâone driving straight through the intersection and another, perhaps turning. This occurs at Location A for many intersection approaches. Speed measurements summarized in the histograms for each data collection period separately (before or after) are from approximately the same vehicles passing through the measurement locations.
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-2 Kittelson & Associates, Inc. Site=OR1 Approach=NB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 16 5 ft 0 5 10 15 20 25 30 P er ce nt No. of obs 417 Min 8.3 Mean 29.3 Std Dev 5.2 Max 41.5 After No. of obs 235 Min 10.4 Mean 27.6 Std Dev 5.3 Max 40.2 26 5 ft 0 5 10 15 20 25 30 P er ce nt No. of obs 410 Min 9.9 Mean 35.0 Std Dev 5.7 Max 48.8 No. of obs 234 Min 4.6 Mean 33.5 Std Dev 6.3 Max 50.0 60 0 ft 0 5 10 15 20 25 30 P er ce nt No. of obs 410 Min 8.2 Mean 44.7 Std Dev 8.0 Max 64.9 No. of obs 230 Min 8.6 Mean 43.8 Std Dev 9.2 Max 68.3 18 00 ft 6 12 18 24 30 36 42 48 54 60 66 72 78 84 0 5 10 15 20 25 30 P er ce nt No. of obs 385 Min 16.4 Mean 52.4 Std Dev 8.6 Max 77.8 6 12 18 24 30 36 42 48 54 60 66 72 78 84 No. of obs 234 Min 12.9 Mean 51.4 Std Dev 9.7 Max 83.4 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-1 Distribution of Speeds by Data Collection Period and Location for OR1 Northbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-3 Site=OR1 Approach=EB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 10 0 ft 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 180 Min 10.7 Mean 30.4 Std D ev 7.0 Max 50.4 After N o. of obs 437 Min 7.8 Mean 28.3 Std Dev 6.4 Max 56.5 25 0 ft 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 177 Min 19.5 Mean 37.0 Std D ev 5.9 Max 53.3 N o. of obs 440 Min 6.1 Mean 35.0 Std Dev 6.6 Max 58.3 60 0 ft 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 177 Min 27.1 Mean 44.3 Std D ev 6.0 Max 59.2 N o. of obs 429 Min 7.2 Mean 41.7 Std Dev 7.1 Max 59.0 13 00 ft 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 159 Min 27.5 Mean 49.2 Std D ev 6.7 Max 72.2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 N o. of obs 432 Min 14.1 Mean 47.4 Std Dev 8.1 Max 72.0 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-2 Distribution of Speeds by Data Collection Period and Location for OR1 Eastbound
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-4 Kittelson & Associates, Inc. Site=OR2 Approach=NB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 10 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,457 Min 4.3 Mean 37.6 Std Dev 11.4 Max 65.2 After No. of obs 1,023 Min 11.4 Mean 38.0 Std Dev 10.5 Max 67.8 70 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,399 Min 16.7 Mean 47.4 Std Dev 6.3 Max 66.0 No. of obs 971 Min 10.8 Mean 47.2 Std Dev 6.4 Max 72.8 15 00 ft 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,278 Min 10.4 Mean 46.8 Std Dev 6.3 Max 65.5 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 No. of obs 850 Min 15.3 Mean 47.1 Std Dev 5.7 Max 65.1 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-3 Distribution of Speeds by Data Collection Period and Location for OR2 Northbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-5 Site=OR2 Approach=SB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 25 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,307 Min 12.3 Mean 42.6 Std Dev 7.8 Max 69.5 After No. of obs 571 Min 16.2 Mean 42.2 Std Dev 7.0 Max 60.6 62 5 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,302 Min 14.1 Mean 48.5 Std Dev 6.0 Max 73.2 No. of obs 576 Min 4.7 Mean 47.5 Std Dev 6.4 Max 63.9 13 00 ft 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,264 Min 15.5 Mean 49.8 Std Dev 5.7 Max 75.8 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 No. of obs 581 Min 21.3 Mean 48.7 Std Dev 5.9 Max 66.1 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-4 Distribution of Speeds by Data Collection Period and Location for OR2 Southbound
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-6 Kittelson & Associates, Inc. Site=OR3 Approach=EB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (50 mph) Before 10 0 ft 0 10 20 30 40 P er ce nt N o. of obs 1,381 Min 7.0 Mean 45.3 Std D ev 9.1 Max 68.4 After N o. of obs 780 Min 8.1 Mean 44.9 Std Dev 8.5 Max 67.5 25 0 ft 0 10 20 30 40 P er ce nt N o. of obs 1,351 Min 8.3 Mean 47.0 Std D ev 7.2 Max 90.2 N o. of obs 802 Min 11.6 Mean 46.5 Std Dev 6.3 Max 67.0 50 0 ft 0 10 20 30 40 P er ce nt N o. of obs 1,356 Min 14.5 Mean 48.9 Std D ev 5.5 Max 71.2 N o. of obs 777 Min 23.4 Mean 48.3 Std Dev 5.4 Max 67.3 12 00 ft 4 12 20 28 36 44 52 60 68 76 84 92 0 10 20 30 40 P er ce nt N o. of obs 1,336 Min 18.0 Mean 49.6 Std D ev 5.6 Max 71.4 4 12 20 28 36 44 52 60 68 76 84 92 N o. of obs 785 Min 5.4 Mean 49.2 Std Dev 6.8 Max 74.0 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-5 Distribution of Speeds by Data Collection Period and Location for OR3 Eastbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-7 Site=OR4 Approach=WB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 25 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,349 Min 9.6 Mean 52.6 Std Dev 6.5 Max 74.3 After No. of obs 1,072 Min 19.6 Mean 51.2 Std Dev 6.3 Max 73.0 12 00 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,352 Min 16.0 Mean 52.0 Std Dev 6.7 Max 77.4 No. of obs 1,029 Min 3.9 Mean 50.0 Std Dev 8.6 Max 105 20 00 ft 2 10 18 26 34 42 50 58 66 74 82 90 98 106 0 5 10 15 20 25 30 35 P er ce nt No. of obs 1,366 Min 5.0 Mean 54.8 Std Dev 7.0 Max 78.5 2 10 18 26 34 42 50 58 66 74 82 90 98 106 No. of obs 1,070 Min 4.6 Mean 53.3 Std Dev 7.6 Max 78.5 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-6 Distribution of Speeds by Data Collection Period and Location for OR4 Westbound
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-8 Kittelson & Associates, Inc. Site=OR6 Approach=EB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 10 0 ft 0 5 10 15 20 25 30 35 40 P er ce nt No. of obs 822 Min 13.5 Mean 51.5 Std Dev 9.4 Max 66.6 After No. of obs 1,029 Min 15.0 Mean 53.1 Std Dev 8.2 Max 74.4 25 0 ft 0 5 10 15 20 25 30 35 40 P er ce nt No. of obs 852 Min 23.2 Mean 52.7 Std Dev 6.7 Max 66.4 No. of obs 1,065 Min 5.4 Mean 53.6 Std Dev 6.9 Max 76.7 90 0 ft 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 0 5 10 15 20 25 30 35 40 P er ce nt No. of obs 918 Min 8.9 Mean 55.9 Std Dev 4.9 Max 71.6 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 No. of obs 1,125 Min 14.8 Mean 56.3 Std Dev 5.0 Max 76.7 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-7 Distribution of Speeds by Data Collection Period and Location for OR6 Eastbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-9 Site=OR6 Approach=WB Treatment=Transverse Pavement Markings Gray l ine--Speed l im i t (55 mph) Before 28 0 ft 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 1,139 Min 4.7 Mean 51.0 Std D ev 8.3 Max 69.2 After N o. of obs 668 Min 12.6 Mean 51.8 Std Dev 8.0 Max 68.7 44 0 ft 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 1,079 Min 13.5 Mean 53.3 Std D ev 6.4 Max 74.2 N o. of obs 685 Min 33.6 Mean 52.2 Std Dev 5.6 Max 66.7 98 0 ft 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 1,212 Min 7.2 Mean 55.5 Std D ev 5.7 Max 73.3 N o. of obs 687 Min 37.7 Mean 55.6 Std Dev 5.0 Max 71.9 15 80 ft 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 0 5 10 15 20 25 30 35 P er ce nt N o. of obs 1,232 Min 15.3 Mean 54.5 Std D ev 9.6 Max 76.2 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 N o. of obs 683 Min 17.6 Mean 53.3 Std Dev 9.7 Max 76.9 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-8 Distribution of Speeds by Data Collection Period and Location for OR6 Westbound
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-10 Kittelson & Associates, Inc. Site=TX1 Approach=SB Treatment=Rumble Strips Gray l ine--Speed l im i t (70 mph) Before-Lane 1 10 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 395 Min 23.4 Mean 58.7 Std Dev 8.6 Max 75.9 Before-Lane 2 No. of obs 948 Min 19.4 Mean 56.5 S td Dev 12.0 Max 78.8 After-Lane 1 No. of obs 390 Min 31.0 Mean 58.4 S td Dev 7.7 Max 75.2 After-Lane 2 No. of obs 884 Min 24.3 Mean 56.6 Std Dev 11.7 Max 80.7 20 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 384 Min 16.5 Mean 59.9 Std Dev 7.7 Max 76.8 No. of obs 945 Min 17.4 Mean 59.1 S td Dev 9.1 Max 79.1 No. of obs 395 Min 42.0 Mean 59.8 S td Dev 7.1 Max 75.3 No. of obs 901 Min 35.1 Mean 58.6 Std Dev 9.0 Max 81.4 60 0 ft 0 5 10 15 20 25 30 35 P er ce nt No. of obs 407 Min 38.7 Mean 63.4 Std Dev 5.8 Max 77.9 No. of obs 950 Min 20.3 Mean 63.4 S td Dev 6.7 Max 80.0 No. of obs 396 Min 34.5 Mean 62.7 S td Dev 6.6 Max 76.2 No. of obs 888 Min 30.9 Mean 62.8 Std Dev 7.3 Max 89.5 18 00 ft 15 30 45 60 75 90 105 0 5 10 15 20 25 30 35 P er ce nt No. of obs 417 Min 40.0 Mean 65.5 Std Dev 6.0 Max 81.1 15 30 45 60 75 90 105 No. of obs 946 Min 35.7 Mean 66.2 S td Dev 6.3 Max 85.2 15 30 45 60 75 90 105 No. of obs 411 Min 22.6 Mean 65.5 S td Dev 6.7 Max 83.0 15 30 45 60 75 90 105 No. of obs 849 Min 36.8 Mean 66.1 Std Dev 6.4 Max 110 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-9 Distribution of Speeds by Data Collection Period and Location for TX1 Southbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-11 Site=TX2 Approach=NB Treatment=Rumble Strips Gray l ine--Speed l im i t (70 mph) Before-Lane 1 17 5 ft 0 10 20 30 40 50 P er ce nt No. of obs 273 Min 18.4 Mean 56.4 Std Dev 8.0 Max 81.4 Before-Lane 2 No. of obs 80 Min 29.6 Mean 56.6 S td Dev 9.3 Max 81.1 After-Lane 1 No. of obs 313 Min 10.6 Mean 54.7 S td Dev 10.0 Max 75.3 After-Lane 2 No. of obs 859 Min 10.4 Mean 57.2 Std Dev 8.5 Max 85.6 30 0 ft 0 10 20 30 40 50 P er ce nt No. of obs 294 Min 12.2 Mean 55.5 Std Dev 10.4 Max 81.6 No. of obs 320 Min 18.9 Mean 56.3 S td Dev 7.8 Max 74.8 75 0 ft 0 10 20 30 40 50 P er ce nt No. of obs 315 Min 44.6 Mean 63.0 Std Dev 5.5 Max 84.5 No. of obs 98 Min 38.1 Mean 61.1 S td Dev 7.7 Max 84.5 No. of obs 297 Min 16.7 Mean 58.3 S td Dev 10.7 Max 76.9 No. of obs 971 Min 24.7 Mean 61.7 Std Dev 6.6 Max 87.6 18 00 ft 9 21 33 45 57 69 81 0 10 20 30 40 50 P er ce nt 9 21 33 45 57 69 81 No. of obs 100 Min 23.8 Mean 65.0 S td Dev 8.3 Max 77.6 9 21 33 45 57 69 81 9 21 33 45 57 69 81 No. of obs 998 Min 20.9 Mean 66.3 Std Dev 6.3 Max 87.4 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-10 Distribution of Speeds by Data Collection Period and Location for TX2 Northbound
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-12 Kittelson & Associates, Inc. Site=TX2 Approach=SB Treatment=Rumble Strips Gray l ine--Speed l im i t (70 mph) Before-Lane 2 10 0 ft 0 20 40 60 80 100 P er ce nt No. of obs 48 Min 14.8 Mean 56.0 Std D ev 10.7 Max 77.4 After-Lane 2 N o. of obs 264 Min 21.6 Mean 54.8 Std Dev 8.1 Max 75.6 25 0 ft 0 20 40 60 80 100 P er ce nt No. of obs 47 Min 26.5 Mean 57.8 Std D ev 8.9 Max 78.5 N o. of obs 230 Min 24.6 Mean 55.4 Std Dev 8.2 Max 75.7 75 0 ft 0 20 40 60 80 100 P er ce nt No. of obs 47 Min 50.7 Mean 61.5 Std D ev 7.0 Max 79.5 N o. of obs 257 Min 20.3 Mean 59.1 Std Dev 6.7 Max 76.2 16 15 ft 18 30 42 54 66 78 90 0 20 40 60 80 100 P er ce nt No. of obs 43 Min 48.8 Mean 67.2 Std D ev 6.5 Max 85.2 18 30 42 54 66 78 90 N o. of obs 245 Min 43.0 Mean 66.7 Std Dev 5.3 Max 80.4 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-11 Distribution of Speeds by Data Collection Period and Location for TX2 Southbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-13 Site=TX4 Approach=WB Treatment=Dynamic Warning Sign Gray l ine--Speed l im i t (55 mph) Before 30 0 ft 0 5 10 15 20 25 30 35 40 45 P er ce nt No. of obs 389 Min 24.5 Mean 52.0 Std Dev 7.2 Max 84.1 After No. of obs 816 Min 12.0 Mean 49.1 Std Dev 7.1 Max 67.4 60 0 ft 0 5 10 15 20 25 30 35 40 45 P er ce nt No. of obs 452 Min 23.7 Mean 53.7 Std Dev 5.2 Max 67.4 No. of obs 796 Min 18.0 Mean 51.6 Std Dev 6.0 Max 80.7 18 00 ft 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 30 35 40 45 P er ce nt No. of obs 439 Min 14.7 Mean 55.1 Std Dev 5.5 Max 73.9 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 No. of obs 781 Min 19.6 Mean 54.5 Std Dev 6.1 Max 78.2 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-12 Distribution of Speeds by Data Collection Period and Location for TX4 Westbound
Appendix F NCHRP 3-74 Speed Profile Histogram Selection of Speed Reduction Treatments at High-Speed Intersections Page F-14 Kittelson & Associates, Inc. Site=WA1 Approach=EB Treatment=Dynamic Warning Sign Gray l ine--Speed l im i t (50 mph) Before 85 0 ft 0 5 10 15 20 25 30 P er ce nt No. of obs 1,036 Min 8.5 Mean 47.4 Std Dev 6.0 Max 65.9 After No. of obs 352 Min 9.1 Mean 44.2 Std Dev 7.1 Max 64.9 11 20 ft 6 14 22 30 38 46 54 62 70 78 86 0 5 10 15 20 25 30 P er ce nt No. of obs 959 Min 16.0 Mean 48.2 Std Dev 6.4 Max 84.5 6 14 22 30 38 46 54 62 70 78 86 No. of obs 352 Min 4.5 Mean 46.2 Std Dev 7.1 Max 89.6 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-13 Distribution of Speeds by Data Collection Period and Location for WA1 Eastbound
NCHRP 3-74 Appendix F Selection of Speed Reduction Treatments at High-Speed Intersections Speed Profile Histogram Kittelson& Associates, Inc. Page F-15 Site=WA1 Approach=WB Treatment=Dynamic Warning Sign Gray l ine--Speed l im i t (50 mph) Before 37 5 ft 0 10 20 30 40 50 P er ce nt N o. of obs 390 Min 5.8 Mean 43.3 Std D ev 7.2 Max 61.6 After N o. of obs 533 Min 3.4 Mean 42.2 Std Dev 7.4 Max 95.4 85 0 ft 0 10 20 30 40 50 P er ce nt N o. of obs 427 Min 10.1 Mean 47.4 Std D ev 7.2 Max 85.8 N o. of obs 480 Min 4.2 Mean 45.4 Std Dev 6.7 Max 98.7 11 50 ft 0 10 20 30 40 50 P er ce nt N o. of obs 456 Min 10.3 Mean 49.5 Std D ev 6.1 Max 69.8 N o. of obs 582 Min 4.0 Mean 46.7 Std Dev 7.4 Max 67.7 18 50 ft 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 0 10 20 30 40 50 P er ce nt N o. of obs 478 Min 11.5 Mean 51.7 Std D ev 6.5 Max 70.8 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 N o. of obs 563 Min 14.4 Mean 50.6 Std Dev 6.1 Max 70.5 Speed (mph) D is ta nc e fro m In te rs ec tio n Exhibit F-14 Distribution of Speeds by Data Collection Period and Location for WA1 Westbound
