Theoretical Research on Longitudinal Profile Design of Superhighways

Table 15

The minimum radius of a concave vertical curve of a superhighway.

Design speed (km/h)	Stopping sight distance ST (m)	Impact mitigation	Lighting distance	Sight distance under the bridge	Adopted value	Value specified in the standard
						Ultimate minimum radius (m)	General minimum radius (m)	Minimum length of the vertical curve (m)
180	360	9000ω	6364ω	4814ω	7000	7000	10500	145
160	310	7111ω	5416ω	3570ω	6000	6000	9000	130
140	260	5444ω	4470ω	2511ω	5000	5000	7500	115
120	210	4000ω	3527ω	1638ω	4000	4000	6000	100
100	160	2778ω	2590ω	951ω	3000	3000	4500	85