Research Article
Traffic Flow Modeling of Freeway Variable Speed Limit Control Based on the Big Data of Driving Behavior
Table 2
Percentages of smaller than 1 s headway within different density intervals under different speed limits.
| Lane | Density intervals (veh/km) | Percentage of less than 1 s headway under different speed limits | No VSL | 120 km/h | 100 km/h | 80 km/h | 60 km/h | 50 km/h |
| Left lane | 0–5 | 24% | 21% | 15% | — | — | — | 5–10 | 32% | 28% | 19% | 15% | — | — | 10–15 | 35% | 26% | 14% | 10% | — | — | 15–20 | 37% | 26% | 14% | 11% | 15% | 20% | 20–25 | 36% | 29% | 14% | 16% | 18% | — |
| Middle lane | 25–30 | 9% | 6% | — | — | — | — | 5–10 | 15% | 11% | 7% | — | — | — | 10–15 | 22% | 16% | 12% | 7% | — | — | 15–20 | 26% | 20% | 14% | 12% | 14% | 14% | 20–25 | 23% | 22% | 14% | — | — | — |
| Right lane | 25–30 | 3% | 3% | — | — | — | — | 5–10 | 7% | 6% | 4% | 3% | — | — | 10–15 | 13% | 11% | 5% | 4% | 5% | — | 15–20 | 18% | 14% | — | — | — | — |
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