| Parameter | Posterior mean | P-value |
| Intercept | −8.0551 | <0.0001 |
| Log (volume) | 0.6992 | <0.0001 |
| Length | 0.7602 | <0.0001 |
| Speed Diff | 0.0278 | 0.002 |
| S-curve vs. single curve | 0.1061 | 0.5443 |
| Multiple vs. single curve | 0.4392 | 0.0463 |
| Spring vs. winter | −0.3236 | 0.0460 |
| Summer vs. winter | −0.3088 | 0.06604 |
| Fall vs. winter | −0.5034 | 0.004 |
| 2005 vs. 2011 | 1.2227 | <0.0001 |
| 2006 vs. 2011 | 0.9846 | 0.0005 |
| 2007 vs. 2011 | 0.9411 | 0.0009 |
| 2008 vs. 2011 | 0.5879 | 0.0476 |
| 2009 vs. 2011 | 0.2842 | 0.3684 |
| 2010 vs. 2011 | 0.6984 | 0.0158 |
| Parameters for probability model | ||
| Intercept | −1.1540 | 0.006 |