Research Article
An Improved Car-Following Speed Model considering Speed of the Lead Vehicle, Vehicle Spacing, and Driver’s Sensitivity to Them
Table 5
Calibrated coefficients of the Taylor expansion approximation form of the Helbing-Tilch model.
| Variable | Model coefficient | t-statistic value |
| Constant term | −9.3173 | −258.90 | Vehicle spacing | 7.6629 | 873.80 | Third powered vehicle spacing | −3.3027 | −452.79 | Fifth powered vehicle spacing | 6.1323 | 316.08 | Adjusted = 0.61 |
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