Variable Type

Variable Name

Base Variable

Estimate

Standard

Error

p-value

Property Damage (cost in thousands)

Cost of property damage

Continuous Variable

0.0006

0.000

0.0000

Lighting

Darkness

Daylight

0.898

0.349

0.0100

Urban/Rural

Urban

Rural

−7.381

0.276

0.0000

Major Cause

FTYROW: To pedestrian

Ran Stop Sign

−4.307

1.602

0.0072

Crossed centerline (undivided)

20.975

1.466

0.0000

Crossed median (divided)

15.570

4.605

0.0007

Traveling wrong way or on wrong side of road

7.143

1.331

0.0000

Ran off road—right

9.183

0.476

0.0000

Ran off road—straight

6.302

1.101

0.0000

Ran off road—left

8.525

0.538

0.0000

Separation of units

23.628

4.012

0.0000

Cargo/equipment loss or shift

11.593

2.165

0.0000

Oversized Load/Vehicle

26.519

5.085

0.0000

Environmental Circumstances

Weather conditions

None Apparent

1.240

0.365

0.0007

Primary Weather

Fog/smoke/smog

Clear

5.208

0.989

0.0000

Freezing rain/drizzle

0.336

0.640

0.5992

Sleet/hail

−0.419

1.985

0.8326

Snow

−0.669

0.480

0.1632

Blowing snow

3.348

0.830

0.0001

Roadway Lighting

Dark - roadway not lighted

Day Light

6.542

0.406

0.0000

Dark - unknown roadway lighting

5.527

1.281

0.0000

Surface Condition

Ice/frost

Dry

−0.075

0.410

0.8552

Snow

−0.311

0.451

0.4901

Slush

−0.686

0.761

0.3672

Road System

Interstate

Local Road

−1.896

1.363

0.1644

Iowa Route

−1.728

1.360

0.2037

Severity

Fatal

Property Damage

108.833

0.980

0.0000

Major Injury

28.489

0.511

0.0000

Minor Injury

8.714

0.264

0.0000

Possible/Unknown

4.277

0.207

0.0000

Road Type

Non-intersection: Railroad grade crossing

Intersection: Intersection with Ramp

15.831

1.658

0.0000

Non-intersection: Alley

3.334

1.345

0.0132

Non-intersection: Crossover-related

7.053

1.298

0.0000

Intersection: Roundabout

1.124

1.503

0.4544

Intersection: Traffic circle

0.837

4.944

0.8656

Intersection: Four-way intersection

3.645

0.536

0.0000

Intersection: T-intersection

4.128

0.586

0.0000

Intersection: Y-intersection

4.564

1.571

0.0037

Intersection: Five points or more

3.398

1.941

0.0800

Intersection: L-intersection

6.119

1.964

0.0018

Intersection: Shared use path or trail

11.946

5.565

0.0318

Interchange-related: On-ramp merge area

4.824

1.028

0.0000

Interchange-related: Off-ramp diverge area

5.872

1.227

0.0000

Interchange-related: On-ramp

7.193

1.634

0.0000

Interchange-related: Off-ramp

4.434

1.186

0.0002

Interchange-related: Mainline - between ramps

8.102

2.019

0.0001

Intersection: Other intersection

4.191

0.830

0.0000

Interchange-related: Other relationship

5.781

2.337

0.0134

Work-zone Related

In work-zone area

Not in work-zone

2.186

0.673

0.0011