Research Article
Quantification of Rear-End Crash Risk and Analysis of Its Influencing Factors Based on a New Surrogate Safety Measure
Table 3
Summary of variables descriptive statistics.
| Independent variables (behavioral variables) | Variables | Mean | Std. Dev | Min | Max | Duration of car-following event (0.1 s) | 286.66 | 146.44 | 151 | 1010 | Mean time headway (s) | 2.01 | 0.77 | 0.53 | 8.17 | Average speed difference (m/s) | 1.11 | 0.75 | 0.09 | 7.15 | Acceleration difference ratio | 0.91 | 0.38 | 0.00 | 4.08 |
| Independent variables (temporal variables) | Variables | Dummy variable | Count | Day-of-week | Holiday | 4200 | Workday | 12705 | Time-of-day | Off peak | 9368 | Morning peak | 3873 | Evening peak | 3664 |
| Independent variables (environmental variables) | Variables | Dummy variable | Count | Light condition | Daytime | 12456 | Nighttime | 4449 | Weather condition | Sunny | 14587 | Rainy | 2318 | Traffic density | High | 1604 | Median | 4495 | Low | 10806 |
| Dependent variables (driving risk) | Variables | Mean | Std. Dev | Min | Max | RCRI | 0.0031 | 0.0061 | 0.0000 | 0.7736 |
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