2 + 1 Highways: Overview and Future Directions

Table 1

Comparison of international 2 + 1 operational characteristics.

Country	Speed limit (km/h)	Design speed (km/h)	AADT (veh/day)
Sweden [10]	90–110	—	4,000–20,000
Norway [28]	90–110	—	6,000–22,000
Germany [1, 21, 29]	100	100–110	7,000–25,000
Finland [30]	100	—	8,000–13,000
Denmark [21, 31]	80–90	—	7,000–15,000
Ireland [8]	100	100	≤14,000
United Kingdom [32]	100	—	≤25,000
Austria (proposed) [21]	≤100	—	7,000–18,000
New Zealand [21]	100	—	10,000–25,000
Poland [22, 33]	100	—	10,000–25,000

Note. Values not reported on the references are indicated as “—.”