Theoretical Research on Longitudinal Profile Design of Superhighways

Table 12

The minimum radius and length of a convex vertical curve of an ordinary highway.

Design speed (km/h)	Stopping sight distance ST (m)	Impact mitigation	Lighting distance	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	11025ω	11000ω	11000	17000	100
100	160	2778ω	6400ω	6500ω	6500	10000	85
80	110	1778ω	3025ω	3000ω	3000	4500	70
60	75	1000ω	1406ω	1400ω	1400	2000	50
40	40	444ω	400ω	450ω	450	700	35
30	30	250ω	225ω	250ω	250	400	25
20	20	111ω	100ω	100ω	100	200	20