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