Parameter

Posterior mean

P-value

Intercept

−7.4295

<0.0001

Log (volume)

0.6456

<0.0001

Length

0.6784

<0.0001

Speed Diff

0.0432

<0.0001

S-curve vs. single curve

−0.3602

0.0174

Multiple vs. single curve

0.1819

0.0002

Spring vs. winter

−0.1159

0.3239

Summer vs. winter

−0.3105

0.0202

Fall vs. winter

−0.3247

0.0128

2005 vs. 2011

1.3004

<0.0001

2006 vs. 2011

1.0324

<0.0001

2007 vs. 2011

1.0054

<0.0001

2008 vs. 2011

0.8083

0.0005

2009 vs. 2011

0.4502

0.0693

2010 vs. 2011

0.8056

0.0005

Parameters for probability model

Intercept

−3.9830

0.0002

Speed Diff

0.1219

0.0003