Theoretical Research on Longitudinal Profile Design of Superhighways

Table 14

The minimum radius of a concave vertical curve of an ordinary highway.

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)
120	210	4000ω	3527ω	1638ω	4000ω	4000	6000	100
100	160	2778ω	2590ω	951ω	3000ω	3000	4500	85
80	110	1778ω	1666ω	449ω	2000ω	2000	3000	70
60	75	1000ω	1036ω	209ω	1000ω	1000	1500	50
40	40	444ω	445ω	59ω	450ω	450	700	35
30	30	250ω	293ω	33ω	250ω	250	400	25
20	20	111ω	157ω	15ω	100ω	100	200	20