AASHTO's Highway Safety Manual
NCHRP 600: Human Factors Guidelines for Road Systems
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
State calibration efforts are currently underway and calibration factors will be released upon completion, which is expected to be December 2013.
- Methods for developing an effective roadway safety management program and evaluating their effects.
- A predictive method to estimate crash frequency and severity.
- A catalog of crash modification factors (CMFs) for a variety of geometric and operational treatment types, backed by robust scientific evidence.
NCHRP Report 500 Series
Louisiana-specific Cost of Crashes
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
| || Average Cost per Person || Including Loss of Quality of Life |
| Fatal || $1,270,370 || $4,376,304 |
| Severe || $938,791 || $2,037,475 |
| Moderate || $164,396 || $306,905 |
| Complaint || $8,141 || $11,036 |
| PDO || $3,292 || $3,292 |
*Based on NHTSA's "The Economic Impact of Motor Vehicle Crashes, 2000" and updated by the CPI