Review Article
2 + 1 Highways: Overview and Future Directions
Table 8
Comparison of percentage of following vehicles on 2 + 1 highways.
| Country | Median barriers | Following vehicles variation (%) |
| Germany [21] | No | −15 | Germany [3] | No | −23 to −2 | South Korea [49] | No | −8 (one section) | Poland [22] | No | −7 (one section) | United States [2] | No | −28 to −15 | United States [9] | No | −14 |
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