Page 107 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

60 mi/h (ft) 7080 6190 5410 4700 4060 3530 3090 2700 2350 2010 1500

R 10300
V d
55 mi/h (ft)

R 8650 5950 5180 4500 3870 3310 2860 2490 2170 1880 1600 1190
V d
50 mi/h (ft) 926

Minimum Radii for Design Speeds from 15 to 60 mi/h (24 to 97 km/h) and Superelevation Rates to 4 Percent
R 7220 4940 4280 3690 3130 2660 2290 1980 1720 1480 1260
V d
45 mi/h (ft) 970 711

R 5930 4040 3480 2980 2490 2100 1800 1550 1340 1150
V d
40 mi/h (ft) 4770 3220 2760 2340 1930 1620 1370 1180 1010 865 730 533

V d R A Policy on Geometric Design of Highways and Streets, American Association of State Highway and Transportation Officials, Washington, D.C., 2004, with permission.
35 mi/h (ft) 982 835 714 610 512 371

R 3730 2490 2120 1760 1420 1170
V d
30 mi/h (ft) 2830 1880 1580 1270 1000 817 681 576 490 416 348 250

V d R

25 mi/h (ft) 2050 1340 1110 838 650 524 433 363 307 259 215 154

V d R Use of e max 4 percent should be limited to urban conditions.
20 mi/h (ft) 902 723 513 388 308 251 209 175 147 122 86

R 1410 Conversions: 1 mi/h 1.609 km/h, 1 ft 0.305 m.
V d
15 mi/h (ft) R 796 506 399 271 201 157 127 105 88 73 61 42 R radius of curve V d design speed e rate of superelevation

TABLE 2.7 V d e (%) 1.5 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 Note: Source:

90