Research Article
Steady-State Car-Following Time Gaps: An Empirical Study Using Naturalistic Driving Data
Table 2
Mean and COV for all drivers for all speed intervals.
| Driver No. | | Speed Interval (km/h) | | | | | | | ≥ 108 |
| 124 | Mean (s) | 2.50 | 2.22 | 2.31 | 2.83 | 1.05 | 1.29 | 1.04 | COV (%) | 11.9 | 30.0 | 29.1 | 43.4 | 53.7 | 50.4 | 62.9 | 304 | Mean (s) | NA | NA | 1.82 | 1.36 | 1.21 | 1.28 | 1.65 | COV (%) | NA | NA | 25.8 | 35.2 | 32.5 | 35.6 | 35.5 | 316 | Mean (s) | 2.53 | 2.67 | 2.38 | 2.01 | 1.55 | 1.48 | 1.48 | COV (%) | 9.9 | 14.0 | 18.9 | 28.9 | 28.9 | 30.9 | 26.1 | 350 | Mean (s) | 2.60 | 2.59 | 2.46 | 2.28 | 2.08 | 1.50 | 1.55 | COV (%) | 9.0 | 15.0 | 27.5 | 22.3 | 32.0 | 31.8 | 21.9 | 358 | Mean (s) | 2.54 | 2.43 | 2.07 | 1.95 | 1.74 | 1.68 | 1.86 | COV (%) | 9.9 | 19.7 | 21.3 | 21.1 | 23.2 | 23.9 | 23.7 | 363 | Mean (s) | 2.09 | 1.77 | 1.33 | 1.22 | 1.10 | 1.24 | 1.42 | COV (%) | 10.2 | 21.4 | 39.4 | 27.1 | 33.8 | 38.1 | 29.0 | 462 | Mean (s) | NA | 1.53 | 1.28 | 0.93 | 0.81 | 0.98 | 0.97 | COV (%) | NA | 20.8 | 12.7 | 19.5 | 16.7 | 43.9 | 63.8 |
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