| 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 |