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HSM APPLICATIONUSING IHSDM(I-12 TO BUSH)
April Renard, P.E.
LADOTD Highway Safety
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PROJECT
OVERVIEW
Alternative N-S
corridor to I-12
Louisiana
Revised Statute
47:820.2B(e)
4-lane arterial
Limited access
facility
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I-12 TO BUSH PROPOSED ALTERNATIVES
No Build
Alternative B/O
Alternative J
Alternative PAlternative Q
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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 andTransportation
Access
Operations Safety
Utilities
Socioeconomics
Aesthetic and VisualResources
Cultural Resources
Hazardous and ToxicSubstances
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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 andTransportation
Access
Operations Safety
Utilities
Socioeconomics
Aesthetic and VisualResources
Cultural Resources
Hazardous and ToxicSubstances
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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)
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AREAOF ANALYSIS
Existing routes
Proposed
alignments
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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
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DATAREQUIREMENTS
Horizontal curvature
Vertical curvature
Cross sectional elements
Number of lanes andlane width
Shoulder width and
type
Cross slope Roadside foreslope
Median width and
type
ADT
Design Speed
Driveway Density
Roadside HazardRatings
Intersections
Traffic control
Skew angle Turn lanes
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DATA RESOURCES
Highway Needs Database
Surface Type Log File
Data Collection/Management Systems
Network Plans Room LandXML files*
Google Earth
Planning models (Transcad, REMI)
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HIGHWAY NEEDS
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STUDIED SECTIONS
US 190
US 190 Business
LA 21
LA 59 LA 36
LA 435
LA 41
LA 434
US 11
4 Alternatives
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PREDICTED NUMBEROF 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 11.68LA 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 50.74LA 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
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DISTRIBUTIONOF 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%
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COSTOFCRASHES
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
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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)
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Questions?
www.ihsdm.org
April Renard, P.E.LADOTD, Highway Safety
(225)379-1919
http://www.ihsdm.org/mailto:[email protected]:[email protected]://www.ihsdm.org/http://www.ihsdm.org/