Theoretical Research on Longitudinal Profile Design of Superhighways

Table 9

Maximum length of a highway slope (unit: m).

Design speeds (km/h)		120	100	80	60	40	30	20
Longitudinal slope (%)	3	900	1000	1100	1200	—	—	—
	4	700	800	900	1000	1100	1100	1200
	5	—	600	700	800	900	900	1000
	6	—	—	500	600	700	700	800
	7	—	—	—	—	500	500	600
	8	—	—	—	—	300	300	400
	9	—	—	—	—	—	200	300
	10	—	—	—	—	—	—	200