Determination of Curve Speed Zones for Mountainous Freeways

Table 2

The basic characteristics of the curve section.

Road type	Design speed (km/h)	Curve radius (m)	Maximum slope (%)	Average slope (%)
Expressway	80	220	−2.7%	−1.6%
Expressway	80	270	3.1%	2.6%
Expressway	80	325	3.2%	2.8%
Expressway	80	620	2.1%	1.7%
Expressway	80	680	3.7%	2.9%
Expressway	80	470	2.5%	1.4%
Expressway	80	570	−3.7%	−1.8%
Expressway	80	375	1.9%	0.8%
Expressway	120	570	−2.7%	−1.9%
Expressway	120	375	3.2%	2.5%
Expressway	120	470	3.8%	2.8%
Expressway	120	680	−2.9%	−1.8%
Expressway	120	270	−3.5%	−2.6%
Expressway	120	325	2.9%	1.7%
Expressway	120	620	3.2%	2.1%
Expressway	120	220	3.3%	2.2%