Sight distance restriction on highways’ horizontal curves: insights and sensitivity analysis

European Transport Research Review

An Open Access Journal

Table 6 Sensitivity analysis of AB_Available (Available horizontal sight distance), HSO = 3.0 m, SSD > L, Case 2

Design speed (km/h)	60	70	80	90	100	110	120
Stopping sight distance (m)	85	105	130	160	185	220	250
AB (HSO = 3.0), R = Rmin
S = 1.0·L	52	63	74	85	97	110	127
S = 1.5·L	52	64	75	88	100	114	131
S = 2.0·L	53	65	75	86	97	110	127
S = 2.5·L	57	69	79	89	101	112	130
S = 3.0·L	62	75	85	95	108	119	138
S = 3.5·L	68	82	93	103	116	127	148
S = 3.75·L	71	86	97	107	121	132	153
S = 4.0·L	74	90	101	111	125	137	159
S = 4.25·L	78	94	105	116	130	142	165
S = 4.5·L	81	98	110	120	136	147	172
S = 4.75·L	85	102	114	125	141	153	178
S = 5.0·L	88	107	119	130	146	159	185
S = 6.0·L	103	124	138	150	169	182	213
S = 7.0·L	118	142	157	171	192	207	242
S = 7.5·L	125	151	167	182	204	220	257
Horizontal Rmin for emax = 8 %	113	168	229	304	394	501	667

The bold row signifies the critical ratio (S/L) where AB_Available ≥ SSD for all design speeds