| Parameter | Posterior mean | P-value |
| Intercept | −7.7523 | <0.0001 |
| Log (volume) | 0.5269 | <0.0001 |
| Length | 0.7984 | <0.0001 |
| Speed Diff | 0.0329 | <0.0001 |
| S-curve vs. single curve | 0.2163 | 0.2721 |
| Multiple vs. single curve | 0.6136 | 0.0398 |
| Spring vs. winter | −0.3131 | 0.0936 |
| Summer vs. winter | −0.3916 | 0.0502 |
| Fall vs. winter | −0.5374 | 0.0071 |
| 2005 vs. 2011 | 1.6955 | <0.0001 |
| 2006 vs. 2011 | 1.4447 | <0.0001 |
| 2007 vs. 2011 | 1.2980 | 0.0005 |
| 2008 vs. 2011 | 0.8900 | 0.0226 |
| 2009 vs. 2011 | 0.6567 | 0.1093 |
| 2010 vs. 2011 | 1.0992 | 0.0040 |
| Parameters for probability model | ||
| Intercept | −1.3295 | 0.0336 |