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GDOT - Countermeasure Logic
GDOT - Countermeasure Logic

This article outlines all countermeasure logic used by GDOT in the Safety Suite of applications.

Greg Olsen avatar
Written by Greg Olsen
Updated over 2 years ago

The following Countermeasures are available as filters in Numetric, and will appear as recommended countermeasures in Safety Analysis and are available as filters within each Numetric application. Each Countermeasure, its associated treatments, and the logic used to identify crashes associated with that countermeasure are documented below.

Clear Roadside

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Clear Roadside Countermeasure:

  • Vegetation Removal (CMF ID: 307)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Roadside Clear Roadside Countermeasure:

IF

Number of Vehicles ≥ 2

AND

Vehicle Maneuver ≠ Passing, changing Lanes, Backing, PIT

Lighting Improvements (Intersection)

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Lighting Improvements (Intersection) Countermeasure:

  • Provide Intersection Illumination (CMF ID: 436)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Lighting Improvements (Intersection) Countermeasure:

IF

Lighting Conditions = Dark-Not Lighted, Dusk, Dawn

AND

Intersection Related = True

AND

Vehicle Maneuver ≠ Backing, PIT, Stopped

AND

Manner of Collision ≠ Rear End

Lighting Improvements (Non-intersection)

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Lighting Improvements (Non-intersection) Countermeasure:

  • Roadway Lighting (CMF ID: 2844, 2845)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Lighting Improvements (Non-intersection) Countermeasure:

IF

Lighting Conditions = Dark-Not Lighted, Dusk, Dawn

AND

Intersection Related = False

AND

Vehicle Maneuver ≠ Backing, PIT, Stopped

AND

Manner of Collision ≠ Rear End

Pedestrian Control (Intersection)

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Pedestrian Control (Intersection) Countermeasure:

  • Upgrade Crosswalk to High intensity Activated Crosswalk (HAWK) (Unsignalized Intersection, Pedestrian Crashes Only, CMF ID: 2922)

  • Install High Visibility Marked Crosswalks (CMF ID: 4123)

  • Convert WALK / DON'T WALK Pedestrian Signals to Countdown Signals (CMF ID: 5272)

  • Install raised crosswalk (CMF ID: 136)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Pedestrian Control (Intersection) Countermeasure:

IF

Pedestrian Related = True

AND

Intersection Related = True

AND

Person Maneuver = Crossing, Not At Crosswalk; Moving with Traffic On Roadway; Entering Exiting a Bus; Moving Against Traffic on Roadway; Crossing at Crosswalk

Pedestrian Control (Non-intersection)

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Pedestrian Control (Non-intersection) Countermeasure:

  • Upgrade Crosswalk to High intensity Activated Crosswalk (HAWK) (Midblock Crossing, Pedestrian Crashes Only, CMF ID: 9020)

  • Install Raised Median with Marked Crosswalk (CMF ID: 175)

  • Install transverse rumble strips as traffic calming device (CMF ID: 2705, 2707)

  • Install RRFB (CMF ID: 9024)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Pedestrian Control (Non-intersection) Countermeasure:

IF

Pedestrian Related = True

AND

Intersection Related = False

AND

Person Maneuver = Crossing, Not At Crosswalk; Moving with Traffic On Roadway; Moving Against Traffic on Roadway

Pedestrian Sidewalk Improvements

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Pedestrian Sidewalk Improvements Countermeasure:

  • Install Sidewalk or Walkway

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Pedestrian Sidewalk Improvements Countermeasure:

IF

Person Maneuver = Moving Against Traffic on Roadway, Moving With Traffic on Roadway, Entering/Exiting a Bus, Off Roadway

Wildlife Warning

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Wildlife Warning Countermeasure:

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Wildlife Warning Countermeasure:

IF

First Harmful Event = Deer or Animal

Intersection Crashes (vehicle)

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Intersection Crashes (vehicle) Countermeasure:

  • Change intersection from stop control multilane roundabout (CMF ID: 236)

  • Change intersection from stop control Right In - Right Out (RIRO) (Install J-Turn intersection) (CMF ID: 5555)

  • Change intersection from stop control signalized Continuous Green - T / (Install a traffic signal) (CMF ID: 8655/325)

  • Change intersection from stop control to reduced conflict u-turn (RCUT) (CMF ID: 4666)

  • Change intersection from stop control unsignalized High-T (Install median acceleration lane) (CMF ID: 2753)

  • Convert Intersection to a Roundabout (CMF ID: 1634)

  • Convert minor-road stop control to all-way stop control (CMF ID: 314)

  • Add flashers to warning sign (CMF ID: 1851)

  • Countermeasure: Install transverse rumble strips on stop controlled approaches in rural area (CMF ID: 2698)

  • Install intersection ahead warning signs (CMF ID: 1684)

  • Increase retroreflectivity of STOP signs (CMF ID: 6051)

  • Provide "Stop Ahead" pavement markings (CMF ID: 9072)

  • Add 3-inch yellow retroreflective sheeting to signal backplates (CMF ID: 1410)

  • Implement systemic signing and marking improvements at stop-controlled intersections (CMF ID: 8866, 8867)

  • Change from 5-section "doghouse" protected/permissive left turn to flashing yellow arrow protected/permissive left turn (CMF ID: 7694, 7695)

  • Change from permissive only to flashing yellow arrow permissive only (CMF ID: 7700, 7701

  • ADD 3-INCH YELLOW RETROREFLECTIVE SHEETING TO SIGNAL BACKPLATES (CMF ID: 1410)

  • Install Supplemental Signal Heads (Far Side Left & Near Side Right) on All Approaches (Atkins Study)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection Crashes (vehicle) Countermeasure:

IF

Intersection Related = True

AND

Pedestrian or Bicycles Related = False

And

Vehicle Maneuver ≠ U Turn, PIT, Enter / Driveway or Parking

AND

Manner of Collision = Angle, Rear End, Head On

AND

First and Most Harmful Events = Motor Vehicle in Motion

Roadway and Lane Departure Crashes

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Roadway and Lane Departure Crashes Countermeasure:

  • Install Wider Markings (without resurfacing) (CMF ID: 4792)

  • Remove or relocate fixed objects in clear zone (CMF ID: 1024)

  • Install Crash Cushion for Sign Structure/column (CMF ID: 55, 56, 57)

  • Upgrade existing markings to wet-reflective pavement markings (CMF ID: 8103)

  • Flatten side slopes and remove guardrail (CMF ID: 782)

  • Improve Shoulder; Pave (CMF ID: 9723)

  • Install Rumble Strips; Shoulder (CMF ID: 7267)

  • Provide 2-ft paved shoulders (both sides in Rural Areas)(CMF ID: 10400)

  • Install alternative audible lane departure warning treatments (not milled-in rumble stripes) (CMF ID: 9685)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Roadway and Lane Departure Crashes Countermeasure:

IF

Number of Vehicles = 1

AND

Pedestrian or Bicycles Related = False

And

Vehicle Maneuver = Passing, Changing Lanes, Straight, Neg a Curve

AND

First and Most Harmful Events ≠ Deer or Animal

Centerline Crash Related (vehicle)

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Centerline Crash Related (vehicle) Crashes Countermeasure:

  • Pavement Resurfacing, with Centerline and Edgeline Rumble Strips & Widen Markings (CMF ID: 4790)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Centerline Crash Related (vehicle) Countermeasure:

IF

Number of Vehicles ≥ 2

AND

Pedestrian or Bicycles Related = False

AND

Intersection Related = False

AND

Manner of Collision = Sideswipe Opposite Direction, Head On, Angle

AND

First and Most Harmful Events ≠ Deer or Animal

AND

Vehicle Maneuver = Passing, Changing Lanes, Straight, Neg a Curve

Road Diet

Treatments

Countermeasure Logic

Treatments

The following treatments are associated with the Road Diet Crashes Countermeasure:

  • Road Diet Convert 4-Lane Undivided to 2 Lane Plus Turn Lanes (CMF ID: 199)

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Road Diet Countermeasure:

IF

Number of Vehicles ≥ 2

AND

Vehicle Maneuver ≠ Backing, PIT

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