Use Numetric’s built-in FHWA formula reference guide to see information about the calculations and countermeasure logic used in our transportation Applications.

The following formulas are summarized in the Reference Guide:

  • Crash Ratio (Network Screening)
  • Crash Rate (Network Screening)
  • Crashes Per Mile (Network Screening)
  • Benefit (Safety Analysis)
  • Benefit Cost Ratio (Safety Analysis)
  • Unique Benefit (Safety Analysis)
  • Annual Crashes Reduced (Safety Analysis)
  • Annual Severe Crashes Reduced (Safety Analysis)

The following countermeasure logic has been summarized in the Reference Guide:

Intersection Countermeasures

  • Dilemma Zone Detection
  • Intersection Lighting
  • Left Turn Lane
  • Left Turn Phasing Change
  • Right Turn Lane
  • Traffic Signal

Roadway Departure Countermeasures

  • Centerline Rumblestrips
  • Shoulder Rumblestrips
  • Clear Zone Improvements
  • Median Barrier
  • Shoulder Barrier
  • Pave or Widen Shoulder

Other Countermeasures

  • Wildlife Warning Sign
  • Bicycle Warning Sign
  • Curve Sign/Delineation
  • Drainage Improvements
  • Friction Improvements
  • Access Control (aka Median Treatment)
  • New/Extended Passing Lane
  • Runaway Truck Ramp
  • Pavement Resurfacing

How to Access the Formula Reference Guide

To access the Formula Reference Guide, follow the steps outlined below:

  1. Click on the Numetric Dropdown menu, located in the top left corner of the screen
  2. Select Reference Guide from the dropdown list.

A list of all available formulas will be displayed. Click on the name of a formula to learn more about how that formula is used in Numetric.

Did this answer your question?