Table 3 Statistic summary of traffic conflicts and corresponding parameters.

From: Insights into vehicle conflicts based on traffic flow dynamics

Traffic state

All states with pre-set thresholds

All states

J

S→J

J→S

S

F→S

S→F

F

Threshold of TTC

1.500

3.572

2.982

3.414

3.540

3.446

3.578

3.444

3.989

Threshold of DRAC

3.400

3.493

3.493

3.425

3.692

3.356

3.460

3.503

3.814

Threshold of PICUD

0.000

0.052

0.041

0.043

0.045

0.064

0.051

0.049

0.081

Num of conflicts

162

297

67

51

32

38

25

14

18

Average upstream speed (m/s)

Mean

16.167

14.697

10.012

11.134

11.085

12.765

14.735

14.166

19.631

Standard deviation

4.986

4.533

3.768

4.092

4.176

3.945

4.329

3.991

4.543

Average downstream speed (m/s)

Mean

16.077

14.615

9.895

11.352

12.129

11.478

13.994

14.263

19.894

Standard deviation

5.480

4.982

2.566

4.864

3.978

4.189

5.646

4.564

5.897

Difference of speed between upstream and downstream (m/s)

Mean

3.024

2.749

2.145

2.356

2.800

2.012

2.532

2.128

3.523

Standard deviation

2.063

1.875

1.163

1.843

1.496

1.238

1.391

1.472

3.329

Standard deviation of upstream speed

Mean

3.013

2.739

2.429

2.872

2.670

2.372

2.237

2.329

2.523

Standard deviation

2.100

1.909

1.346

1.489

1.827

1.634

1.983

2.105

1.766

Standard deviation of downstream speed

Mean

2.937

2.670

2.297

2.989

2.526

2.234

2.303

2.145

2.496

Standard deviation

1.337

1.216

1.223

1.380

1.842

1.961

1.721

1.841

1.236

Coefficient of variation of upstream speed

Mean

0.237

0.216

0.243

0.258

0.241

0.186

0.152

0.164

0.129

Standard deviation

0.054

0.049

0.046

0.024

0.043

0.029

0.035

0.091

0.043

Coefficient of variation of downstream speed

Mean

0.245

0.222

0.232

0.263

0.175

0.208

0.260

0.150

0.125

Standard deviation

0.085

0.077

0.056

0.097

0.065

0.086

0.064

0.043

0.079

Upstream traffic volume (Veh/30 s)

Mean

9.556

8.688

6.671

7.465

7.163

8.165

7.465

8.891

9.465

Standard deviation

5.387

4.898

4.894

3.745

4.748

5.456

3.841

4.642

3.841

Downstream traffic volume (Veh/30 s)

Mean

9.684

8.803

6.784

7.164

7.984

8.065

7.135

9.165

9.723

Standard deviation

5.630

5.118

4.215

4.489

4.921

4.984

4.413

4.654

4.895

Difference of volume between upstream and downstream (Veh/30 s)

Mean

− 0.127

− 0.116

− 0.113

0.301

− 0.821

0.100

0.330

− 0.274

− 0.258

Standard deviation

1.281

1.164

3.256

0.310

1.416

0.465

0.894

0.413

0.654

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