HSM APPLICATION USING IHSDM (I-12 TO BUSH) April Renard, P.E. LADOTD Highway Safety

PROJECT OVERVIEW Alternative N-S corridor to I-12 Louisiana Revised Statute 47:820.2B(e) 4-lane arterial Limited access facility

I-12 TO BUSH PROPOSED ALTERNATIVES No Build Alternative B/O Alternative J Alternative P Alternative Q

ALTERNATIVE SELECTION CRITERIA Land Use Water Resources Ecological Resources Land cover Wildlife Sensitive habitats T&E species Wetlands Geology and Soils Air Quality Noise Recreational Resources Traffic and Transportation Access Operations Safety Utilities Socioeconomics Aesthetic and Visual Resources Cultural Resources Hazardous and Toxic Substances

SAFETY Goal: Quantify the perceived safety benefits from constructing the project. Presumption: Traffic diverted from existing roadways with lesser design standards to proposed alignment with higher design standards will result in a reduction in crashes. Methodology: HSM Predictive Method (most reliable)

AREA OF ANALYSIS Existing routes Proposed alignments

IHSDM SOFTWARE Interactive Highway Safety Design Model Developed in coordination with TRB, AASHTO and FHWA Decision-support tool; evaluates safety and operational effects of geometric design decisions on highways Incorporated HSM Predictive Method in 2010

DATA REQUIREMENTS Horizontal curvature Vertical curvature Cross sectional elements Number of lanes and lane width Shoulder width and type Cross slope Roadside foreslope Median width and type ADT Design Speed Driveway Density Roadside Hazard Ratings Intersections Traffic control Skew angle Turn lanes

DATA RESOURCES Highway Needs Database Surface Type Log File Data Collection/Management Systems Network Plans Room LandXML files* Google Earth Planning models (Transcad, REMI)

HIGHWAY NEEDS

STUDIED SECTIONS US 190 US 190 Business LA 21 LA 59 LA 36 LA 435 LA 41 LA 434 US 11 4 Alternatives

PREDICTED NUMBER OF CRASHES Route Control Section No Build Alt B/O Alt J Alt P Alt Q 1a US 190 013-11 478.44 463.41 468.03 464.58 472.14 US 190-X 013-10 27.54 26.17 26.33 26.25 26.84 LA 21 030-01 88.49 97.14 67.84 46.16 70.52 594.47 586.72 562.2 536.99 569.5 1b LA 59 281-03 84.7 70.77 80.64 76.07 80.66 LA 36 280-01 16.37 15.76 15.44 15.2 15.28 LA 59 852-09 17 11.84 14.32 12.76 11.68 LA 21 030-01 75.72 58.52 37.26 22.7 38.77 193.79 156.89 147.66 126.73 146.39 1c LA 59 281-03 84.7 70.77 80.64 76.07 80.66 LA 435 281-04 29.31 26.29 28.86 41.24 30.57 LA 41 058-02 28.98 24.62 3.22 2.98 3.18 142.99 121.68 112.72 120.29 114.41 2 US 11 018-04 28.69 27.89 25.72 27.42 27.63 LA 41 058-01 91.38 81.12 36.64 61.64 50.74 LA 41 058-02 28.98 24.62 3.22 2.98 3.18 149.05 133.63 65.58 92.04 81.55 3 LA 434 852-12 7.09 4.45 5.6 5.24 5.43 LA 36 280-03 10.11 9.9 12.02 10.93 24.43 LA 41 058-01 53.67 45.87 11.75 30.44 14.58 LA 41 058-02 28.98 24.62 3.22 2.98 3.18 99.85 84.84 32.59 49.59 47.62 4 Proposed Alternative 0 43.58 43.5 30.37 32.5 TOTAL NETWORK CRASHES 1180.15 1127.34 964.25 956.01 991.97

DISTRIBUTION OF CRASHES Severity LA (all) LA (rural 2-lane) HSM (rural 2-lane) Fatal 0.44% 2.08% 1.30% Severe 0.83% 1.08% 5.40% Moderate 6.15% 10.59% 10.90% Possible Injury 21.70% 30.92% 14.50% PDO 70.89% 55.33% 67.90% 100.00% 100% 100.00%

COST OF CRASHES Severity Cost per Person Cost per Person (w/ Loss of Quality of Life) Fatal $1,241,054 $4,275,313 Severe $917,127 $1,990,456 Moderate $160,602 $299,823 Possible Injury $7,953 $10,782 PDO $3,216 $3,216

OVERALL COMPARISON Rank Alternative Total Network Crashes Reduction in Crashes Total Cost of Crashes* Reduction in Cost 1 P 956.01 224.14 $25,693,587.03 $6,023,954.35 2 J 964.25 215.9 $25,915,044.08 $5,802,497.30 3 Q 991.97 188.18 $26,660,042.81 $5,057,498.57 4 B/O 1127.34 52.81 $30,298,227.43 $1,419,313.95 5 No Build 1180.15 0 $31,717,541.38 $0.00 *Louisiana crash distribution and cost estimates (do not include pain and suffering) Rank Alternative Total Network Crashes Reduction in Crashes Total Cost of Crashes* Reduction in Cost 1 P 956.01 224.14 $55,592,679.06 $13,033,904.54 2 J 964.25 215.9 $56,071,841.07 $12,554,742.53 3 Q 991.97 188.18 $57,683,779.29 $10,942,804.31 4 B/O 1127.34 52.81 $65,555,643.57 $3,070,940.03 5 No Build 1180.15 0 $68,626,583.60 $0.00 *Louisiana crash distribution and cost estimates (includes pain and suffering)

Questions? www.ihsdm.org April Renard, P.E. LADOTD, Highway Safety april.renard@la.gov (225)379-1919