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

European Transport Research Review

An Open Access Journal

Table 5 Sensitivity analysis of AB_Available (Available horizontal sight distance), HSO = 4.8 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 = 4.8), R = Rmin
S = 1.0·L	66	80	94	108	123	139	160
S = 1.5·L	67	81	94	108	123	139	160
S = 2.0·L	72	88	100	113	128	142	165
S = 2.5·L	81	98	111	123	139	153	178
S = 3.0·L	91	110	123	136	154	168	195
S = 3.5·L	101	123	137	151	170	184	215
S = 3.75·L	107	129	144	158	178	193	225
S = 4.0·L	113	136	152	166	187	202	236
S = 4.25·L	118	143	159	174	196	212	247
S = 4.5·L	124	150	167	182	205	221	258
S = 4.75·L	130	157	174	190	214	231	270
S = 5.0·L	136	164	182	198	223	241	281
S = 6.0·L	160	193	214	232	261	281	328
S = 7.0·L	185	223	246	267	299	322	376
S = 7.5·L	197	237	262	284	319	343	401
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