Highway Safety Analysis Toolbox


State Policies and Procedures on the Use of the Highway Safety Manual (HSM)


Scale and Scope of Safety Assessment Methods in the Project Development Process


AASHTO's Highway Safety Manual


The HSM introduces a science-based technical approach that takes the guesswork out of safety analysis. The HSM provides tools to conduct quantitative safety analyses, allowing for safety to be quantitatively evaluated alongside other transportation performance measures such as traffic operations, environmental impacts, and construction costs. The HSM provides the following tools:

              • Methods for developing an effective roadway safety management program and evaluating their effects.
              • A predictive method to estimate crash frequency and severity.
              • Guidance on the development and application of crash modification factors to estimate crash reductions.
CAT Scan - 2021 Intersection - 20221012.xlsmCAT Scan - 2021 Intersection - 2022101211/14/2022 10:10 AM3669 KB
CAT Scan - 2021 Segment - 20221012.xlsmCAT Scan - 2021 Segment - 2022101211/14/2022 10:11 AM7141 KB
Crash Analysis Class Advanced - 2018 July.pdfCrash Analysis Class Advanced - 2018 July7/6/2018 6:50 AM3319 KB
Crash Analysis Class Basic - 2018 July.pdfCrash Analysis Class Basic - 2018 July7/6/2018 6:51 AM1915 KB
Crash Data Analysis Guide - 2023 April.pdfCrash Data Analysis Guide - 2023 April4/24/2023 2:42 PM687 KB
Crash1 User Manual_Outside DOTD.pdfCrash1 User Manual_Outside DOTD3/9/2015 12:57 PM1233 KB
Crash3 User Manual_Outside DOTD.pdfCrash3 User Manual_Outside DOTD3/6/2015 7:56 AM606 KB
FINAL_REVISED_HSIP Infrastructure State Routes Project Selection Guide v17_REV.pdfFINAL_REVISED_HSIP Infrastructure State Routes Project Selection Guide v17_REV11/22/2017 1:01 PM517 KB
HSM Rural 2-Lane Roads - June 2015.xlsHSM Rural 2-Lane Roads - June 20157/13/2015 8:10 AM255 KB
HSM Rural Multilane Roads (Divided and Undivided) - March 2016.xlsHSM Rural Multilane Roads (Divided and Undivided) - March 20163/16/2016 6:25 AM203 KB
HSM Urban and Suburban Arterials - June 2015.xlsHSM Urban and Suburban Arterials - June 20157/13/2015 8:10 AM373 KB
LADOTD HSM Implementation.pdfLADOTD HSM Implementation12/18/2013 9:53 AM586 KB
Lat-Long User Manual_Outside DOTD.pdfLat-Long User Manual_Outside DOTD3/6/2015 7:56 AM885 KB
Louisiana Crash Report Manual 2019 .pdfLouisiana Crash Report Manual 2019 11/25/2019 9:00 AM9695 KB
Louisiana Fact Sheet CMF Resource Guide.pdfLouisiana Fact Sheet CMF Resource Guide12/18/2013 9:54 AM1240 KB
Louisiana Fact Sheet Project Map.pdfLouisiana Fact Sheet Project Map12/19/2013 7:58 AM723 KB
Thinkstream User Manual.pdfThinkstream User Manual3/6/2015 7:56 AM1032 KB
Training - CARTS Crash Tool - 2023 11.pdfTraining - CARTS Crash Tool - 2023 1112/12/2023 10:37 AM6123 KB



 NCHRP 600: Human Factors Guidelines for Road Systems


The HFG serves as a complement to existing and planned design guides and standards, such as the MUTCD, AASHTO's Green Book, and the HSM, to promote improved safety for highway users. After using traditional resources to develop possible design alternatives to improve safety on an in service or planned intersection or section of roadway, the practitioner may then use the HFG to enhance the possible solutions. The easy-to-use guidelines in the HFG provide the highway designer and traffic engineer with objective, defensible human factors principles and information that can be used to support and justify design decisions. The HFG will allow the non-expert in human factors to recognize the needs and limitations of the road user in a more effective manner in the design and operation of roads that are safer for all. When reviewing either existing or planned roads or intersections, highway designers and traffic engineers are strongly encouraged to use the HFG to identify and develop the safest solutions for road users.


NCHRP Report 500 Series

Louisiana-specific Cost of Crashes* (Provided by Highway Safety Research Group, 2021) 


Crash Severity Type    

Crash Report Injury Code  Unit Cost Per Crash 
Fatal A    $2,036,913
Severe Injuries B $582,241
Moderate Injuries C $198,021
Complaint Injuries D $66,461
Property Damage Only (PDO)   E $28,363

 Total estimated cost for Louisiana crashes =          $10.1 billion/yr


 *NOTE:  This table is for informational purposes and is intended to be used in conjunction with benefit cost analyses for potential safety projects.


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Pedestrian Crash Assessment


 Roadway Departure Implementation Plan


 Network Screening