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Nebraska - Countermeasure Logic

Written by Lauren Miller

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

Intersection - Divided

Treatments

The following treatments are associated with the Intersection - Divided Countermeasure:

  • Convert Full-Access to 3/4 Access

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Divided Countermeasure:

Intersection Involved = Yes

AND

Median Present (Y/N) = Yes

Intersection - Light

Treatments

The following treatments are associated with the Intersection - Light Countermeasure:

  • Install Lighting - Intersection

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Light Countermeasure:


Intersection Involved = Yes

AND

(Light Condition = (Dark-Not Lighted OR Dark-Unknown Lighting OR Dawn/Dusk))

Intersection - Rural

Treatments

The following treatments are associated with the Intersection - Rural Countermeasure:

  • Convert AWSC to Roundabout - Single Lane - Rural

  • Convert Traffic Signal to Roundabout - Single Lane Or 2-Lane - Rural

  • Convert TWSC to All Way Stop Control - Rural

  • Convert TWSC to Roundabout - 2-Lane - Rural

  • Convert TWSC to Roundabout - Single Lane - Rural

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Rural Countermeasure:


Intersection Involved = Yes

AND

Rural/Urban City Limits = Rural

Intersection - Rural Divided

Treatments

The following treatments are associated with the Intersection - Rural Divided Countermeasure:

  • Convert Traffic Signal to RCUT - Rural

  • Convert TWSC to RCUT - Rural

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Rural Divided Countermeasure:

Intersection Involved = Yes

AND

Rural/Urban City Limits = Rural

AND

Median Present (Y/N) = Yes

Intersection - Traffic Signal

Treatments

The following treatments are associated with the Intersection - Traffic Signal Countermeasure:

  • 3-Section Green Traffic Signal Converted to 3-Section FYA

  • 5-Section Traffic Signal Converted to 4-Section FYA

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Traffic Signal Countermeasure:

Intersection Involved = Yes

Intersection - Urban

Treatments

The following treatments are associated with the Intersection - Urban Countermeasure:

  • Add Pole Mounted Signal Head

  • Convert Traffic Signal to Roundabout - 2-Lane - Urban

  • Convert Traffic Signal to Roundabout - Single Lane - Urban

  • Convert TWSC to Mini-Roundabout - Single Lane - Urban

  • Convert TWSC to Roundabout - 2-Lane - Urban

  • Convert TWSC to Roundabout - Single Lane - Urban

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Urban Countermeasure:
​

Intersection Involved = Yes

AND

Rural/Urban City Limits = Urban

Intersection - Urban Divided

Treatments

The following treatments are associated with the Intersection - Urban Divided Countermeasure:

  • Convert Diamond Interchange to DDI

  • Convert Traffic Signal to RCUT - Urban

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Intersection - Urban Divided Countermeasure:

Intersection Involved = Yes

AND

Rural/Urban City Limits = Urban

AND

Median Present (Y/N) = Yes

Roadway - 2-Lane

Treatments

The following treatments are associated with the Roadway - 2-Lane Countermeasure:

  • Add TWLTL on 2-Lane Road

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Roadway - 2-Lane Countermeasure:


Median Present (Y/N) = No

AND

Number of Through Lanes = 2

Roadway - 2-Lane 0' Paved Shoulder High AADT

Treatments

The following treatments are associated with the Roadway - 2-Lane 0' Paved Shoulder High AADT Countermeasure:

  • Add Paved Shoulder from 0-ft to 2-ft - High AADT

  • Add Paved Shoulder from 0-ft to 4-ft - High AADT

Countermeasure Logic

The following logic is used to determine if crashes would be potentially mitigated by the Roadway - 2-Lane 0' Paved Shoulder High AADT Countermeasure:

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 0-ft

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT > 2000

Roadway - 2-Lane 0' Paved Shoulder Low AADT

Treatments

The following treatments are associated with the Roadway - 2-Lane 0' Paved Shoulder Low AADT Countermeasure:

  • Add Paved Shoulder from 0-ft to 2-ft - Low AADT

  • Add Paved Shoulder from 0-ft to 4-ft - Low AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 0

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT < 400

Roadway - 2-Lane 0' Paved Shoulder Medium AADT

Treatments

The following treatments are associated with the Roadway - 2-Lane 0' Paved Shoulder Medium AADT Countermeasure:

  • Add Paved Shoulder from 0-ft to 2-ft - Medium AADT

  • Add Paved Shoulder from 0-ft to 4-ft - Medium AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 0

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT = 400-2000

Roadway - 2-Lane 11' Lane Width High AADT

Treatments

  • Widen Lane Width from 11-ft to 12-ft - High AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Through Lane Width = 11

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT > 2000

Roadway - 2-Lane 11' Lane Width Low AADT

Treatments

  • Widen Lane Width from 11-ft to 12-ft - Low AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Through Lane Width = 11

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT < 400

Roadway - 2-Lane 11' Lane Width Medium AADT

Treatments

  • Widen Lane Width from 11-ft to 12-ft - Medium AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Through Lane Width = 11

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT = 400-2000

Roadway - 2-Lane 2' Paved Shoulder High AADT

Treatments

  • Widen Paved Shoulder from 2-ft to 4-ft - High AADT

  • Widen Paved Shoulder from 2-ft to 8-ft or more - High AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 2

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT > 2000

Roadway - 2-Lane 2' Paved Shoulder Medium AADT

Treatments

  • Widen Paved Shoulder from 2-ft to 4-ft - Medium AADT

  • Widen Paved Shoulder from 2-ft to 8-ft or more - Medium AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 2

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT = 400-2000

Roadway - 2-Lane 4' Paved Shoulder High AADT

Treatments

  • Widen Paved Shoulder from 4-ft to 8-ft or more - High AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 4

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT > 2000

Roadway - 2-Lane 4' Paved Shoulder Low AADT

Treatments

  • Widen Paved Shoulder from 4-ft to 8-ft or more - Low AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 4

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT < 400

Roadway - 2-Lane 4' Paved Shoulder Medium AADT

Treatments

  • Widen Paved Shoulder from 4-ft to 8-ft or more - Medium AADT

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

Outside Surface Shoulder = 4

AND

Median Present (Y/N) = No

AND

Number of Through Lanes = 2

AND

Roadway Departure = Yes

AND

AADT = 400-2000

Roadway - 2-Lane - Without Centerline Rumble Strips

Treatments

  • Install Centerline Rumble Strips

Countermeasure Logic

Intersection Involved = No

AND

Rural/Urban City Limits = Rural

AND

TWLTL = No

AND

Median Present (Y/N) = No

AND

Centerline Rumble Strip = No

AND

Number of Through Lanes = 2

Roadway - 4-Lane Undivided

Treatments

  • Convert Undivided 4-lane to 3-lane Road with TWLTL

Countermeasure Logic

Median Present (Y/N) = No

AND

Number of Through Lanes = 4

Roadway - Light

Treatments

  • Install Lighting - Roadway

Countermeasure Logic

Intersection Involved = No

AND

(Light Condition = (Dark-Not Lighted OR Dark-Unknown Lighting OR Dawn/Dusk))

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