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.

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