Variable

EX-EN

EN-EX Downstream

Coefficient

Standard Error

t-statistic

p-value

Coefficient

Standard Error

t-statistic

p-value

Constant

1.215

0.267

4.550

0.000

0.480

0.177

2.718

0.009

CRASHRATE (EN-EX)

−0.359

0.146

−2.463

0.017

-

-

-

-

SHOULDER

−0.066

0.015

−4.325

0.000

−0.018

0.010

−1.790

0.079

MEDIAN

−0.020

0.009

−2.105

0.039

AADT

0.000001

0.0000005

2.429

0.018

−0.0000006

0.0000004

−1.744

0.086

RADIUS

−0.00004

0.000018

−2.382

0.020

−0.00002

0.00001

−1.979

0.053

RMSE

0.291

McElroy’s R2

0.605