US16 Corridor Study Crash History Review (2014 – 2018) US16 Corridor Study
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US16 Corridor Study Crash History Review (2014 – 2018) US16 Corridor Study Pennington County, SD August 6, 2019 SDDOT | US16 Corridor Study Crash History Review Table of Contents Introduction ................................................................................................................................ 1 Methodology .............................................................................................................................. 1 US16 Corridor Existing Conditions Summary ............................................................................. 2 US16 Corridor Crash History Summary...................................................................................... 2 US16 Corridor – Crash Severity ............................................................................................. 3 US16 Corridor – Manner of Collision ...................................................................................... 4 US16 Corridor – Other Crash Characteristics ......................................................................... 5 US16 Corridor Seasonal and Daily Crash Trends ..................................................................12 US16 Corridor Median Crossing Review ...............................................................................13 US16 Corridor Segments ..........................................................................................................16 US16 Corridor Crash Segment Summary ..............................................................................16 US16 Corridor Segments Identified for Further Review .........................................................20 US16 Corridor Intersections ......................................................................................................27 US16 Corridor Intersection Summary ....................................................................................27 US16 Corridor Intersections Identified for Further Review .....................................................31 Other Study Area Intersections .................................................................................................37 Conclusions and Next Steps .....................................................................................................39 Appendix ...................................................................................................................................40 Appendices Appendix A – Crash Segment Key ............................................................................................. A Appendix B – Segment Crash Tables ........................................................................................ B Appendix C – Intersection Crash Tables .................................................................................... C List of Figures Figure 1: US16 Corridor – Crashes by Year (2014 - 2018) ......................................................... 3 Figure 2: Crash History (2014 - 2018) ........................................................................................ 8 Figure 3: Fatal and Incapacitating Injury Crashes (2014 - 2018) ................................................ 9 Figure 4: Vehicle Crash History (no vehicle-animal crashes) (2014 - 2018) ..............................10 Figure 5: Vehicle-Animal Crash History (2014 - 2018) ...............................................................11 Figure 6: Winter Weather Crashes (2014 - 2018) ......................................................................14 Figure 7: Median/Centerline Crossing Crashes (2014 - 2018) ...................................................15 Figure 8: Intersection Crashes (2014 - 2018) ............................................................................30 i SDDOT | US16 Corridor Study Crash History Review List of Tables Table 1: US16 Corridor – Crash Severity Summary (2014 – 2018) ............................................ 4 Table 2: US16 Corridor – Manner of Collision Summary (2014 – 2018) ..................................... 4 Table 3: US16 Corridor – Other Crash Characteristic Summary (2014 – 2018) .......................... 5 Table 4: US16 Corridor – Fatal and Serious Injury (F&SI) Crashes by Crash Characteristic (2014 – 2018) ............................................................................................................................ 6 Table 5: US16 Corridor – Time of Day/Month of Year Summary (2014 – 2018) ........................12 Table 6: US16 Corridor Segments – Crash Severity (North of Neck Yoke Road) ......................16 Table 7: US16 Corridor Segments – Crash Severity (South of Neck Yoke Road) .....................17 Table 8: US16 Corridor Segments – Crash Rates (North of Neck Yoke Road) ..........................18 Table 9: US16 Corridor Segments – Crash Rates (South of Neck Yoke Road) .........................18 Table 10: Horizontal Curve (east end) to Neck Yoke Road Crash Summary .............................21 Table 11: Horizontal Curve (west end) to Horizontal Curve (east end) Crash Summary ............22 Table 12: Strato Rim Drive to Busted Five Lane Crash Summary .............................................22 Table 13: US16 W Main Street/Silver Mountain Road (16 WF 55.70) to Pine Haven Drive Crash Summary (Segment 20) ............................................................................................................23 Table 14: US16 E Rockerville Road to Golden Hills Drive Crash Summary (Segment 22) ........24 Table 15: US16 E Rockerville West Ramp (16 E1 55.42) to Rockerville Road (16 EF 55.78) Crash Summary (Segment 23) ..................................................................................................25 Table 16: North of Keystone Wye to Cosmos Road Crash Summary (Segment 30) .................26 Table 17: US16 Corridor TWSC Intersections – Crash Severity (2014 – 2018) .........................27 Table 18: US16 Corridor Signalized Intersections – Crash Severity (2014 – 2018) ...................28 Table 19: US16 Corridor TWSC Intersections – Crash Rates (2014 – 2018) ............................29 Table 20: US16 Corridor Signalized Intersections – Crash Rates (2014 – 2018) .......................29 Table 21: US16 and Wilderness Canyon Road Intersection Crash Summary ...........................31 Table 22: US16 and Moon Meadows Drive Intersection Crash Summary .................................32 Table 23: US16 and Neck Yoke Road Intersection Crash Summary .........................................33 Table 24: US16 and Busted Five Lane Intersection Crash Summary ........................................34 Table 25: US16 E and Rockerville Road Intersection Crash Summary .....................................35 Table 26: US16 and US16B/Catron Boulevard Intersection Crash Summary ............................36 Table 27: Other Study Area Intersections – Crash Severity (2014 – 2018) ................................38 Table 28: Other Study Area Intersections – Crash Rates (2014 – 2018) ...................................38 ii SDDOT | US16 Corridor Study Crash History Review Introduction This memorandum documents the 2014 through 2018 crash history analysis for the US16 corridor between the Keystone Wye (south end) and Cathedral Drive/Fairmont Boulevard (north end). The crash history analysis was conducted to help identify areas that may warrant consideration of safety-related improvements in future design. Methodology Crash data for years 2014 through 2018 was provided by the South Dakota Department of Transportation (SDDOT) through a GIS geodatabase. Crashes were reviewed to identify any historical crash trends or high frequency areas to help develop potential crash mitigation measures for consideration in design. The US16 corridor was broken up into the following for analysis: Intersections Roadway segments All crashes occurring on the US16 corridor were sorted based on whether they were related to a corridor intersection or roadway segment. Low-volume crossroads and private driveways were typically not considered a primary analysis intersection. Crash rates and critical crash rates were calculated for both intersections and roadway segments. Intersection crash rates were calculated in terms of crashes per million entering vehicles (crashes/MEV). Roadway segment crash rates were calculated in terms of million vehicle miles traveled (crashes/MVMT). Critical crash rates were calculated based on the statistical populations for each crash location (intersection or segment), using methods presented in the Highway Safety Manual (American Association of State Highway and Transportation Officials (AASHTO), 2010). A critical crash rate accounts for a desired level of confidence, vehicle exposure, and similar facility types. Intersections and segments where the crash rate exceeds the critical rate should be investigated further. Weighted crash rates were also calculated for corridor segments by weighting each crash in accordance with its severity: fatal crash (12), injury crash (3), and property damage crash (1). Weights were assigned to each crash in accordance with methodology used by the SDDOT in determining statewide average crash rates. This method differs from the calculation of an average crash rate in that the weighted crash rate accounts for injury and fatal crashes through the weighting process. An average crash rate calculation reflects total crash frequency, regardless of injury severity. Intersection and segment crash rates were calculated with available daily traffic count data