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From: Sight distance restriction on highways’ horizontal curves: insights and sensitivity analysis
SSD restrictions | Design speed, Vd (km/h) | ||||||
---|---|---|---|---|---|---|---|
60 | 70 | 80 | 90 | 100 | 110 | 120 | |
Stopping sight distance, SSD (m), AASHTO [2] | 85 | 105 | 130 | 160 | 185 | 220 | 250 |
Calculated radius (m): desirable (HSO = 4.8 m)* | 141 | 215 | 330 | 500 | 668 | 945 | 1221 |
Calculated radius (m): desirable (HSO = 3.0 m) * | 226 | 345 | 528 | 800 | 1070 | 1513 | 1953 |
Minimum radius, Rmin (m), equilibrium concept, e(max) = 8 %, [2] | 113 | 168 | 229 | 304 | 394 | 501 | 667 |
AB Available SSD (m) HSO = 4.8 m, R = Rmin ** | 72 | 88 | 100 | 113 | 128 | 142 | 165 |
AB Available SSD (m) HSO = 3.0 m, R = Rmin** | 53 | 65 | 75 | 86 | 97 | 110 | 127 |