Review Article
2 + 1 Highways: Overview and Future Directions
Table 7
Comparison of speed impacts of 2 + 1 highways.
| | Country | Median barriers | Average speed variation (km/h) | Speed at passing lane (km/h) |
| | Sweden [45] | Yes | +2 | | | Sweden [45] | No | +4 | | | Sweden [10] | Yes | +10 | | | Finland [2] | Yes | +1 | | | Germany [2] | No | +5 to +10 | 100–130 | | Germany [29] | No | +5 to +10 | 100–120 | | Denmark [27] | No | -3 to +4 | | | Finland [30] | No | — | 100–130 | | South Korea [49] | No | +20 (one section) | | | Poland [22] | No | +10 (one section) | | | Japan [38] | Yes | +8 to +14 (simulation) | | | United States [9] | No | Modest | |
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