Page 114 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

HIGHWAY LOCATION, DESIGN, AND TRAFFIC 97

TABLE 2.11 Minimum Radii for Design Speeds from 15 to 80 mi/h (24 to 129 km/h) and
Superelevation Rates to 12 Percent
e V 15 mi/h V 20 mi/h V 25 mi/h V 30 mi/h V 35 mi/h V 40 mi/h V 45 mi/h
d d d d d d d
(%) R (ft) R (ft) R (ft) R (ft) R (ft) R (ft) R (ft)
1.5 950 1690 2460 3370 4390 5580 6910
2.0 700 1250 1820 2490 3260 4140 5130
2.2 631 1130 1640 2250 2950 3750 4640
2.4 574 1030 1500 2060 2690 3420 4240
2.6 526 936 1370 1890 2470 3140 3900
2.8 484 863 1270 1740 2280 2910 3600
3.0 448 799 1170 1620 2120 2700 3350
3.2 417 743 1090 1510 1970 2520 3130
3.4 389 693 1020 1410 1850 2360 2930
3.6 364 649 953 1320 1730 2220 2750
3.8 341 610 896 1250 1630 2090 2600
4.0 321 574 845 1180 1540 1980 2460
4.2 303 542 798 1110 1460 1870 2330
4.4 286 512 756 1050 1390 1780 2210
4.6 271 485 717 997 1320 1690 2110
4.8 257 460 681 948 1260 1610 2010
5.0 243 437 648 904 1200 1540 1920
5.2 231 415 618 862 1140 1470 1840
5.4 220 395 589 824 1090 1410 1760
5.6 209 377 563 788 1050 1350 1690
5.8 199 359 538 754 1000 1300 1620
6.0 190 343 514 723 960 1250 1560
6.2 181 327 492 694 922 1200 1500
6.4 172 312 471 666 886 1150 1440
6.6 164 298 452 639 852 1110 1390
6.8 156 284 433 615 820 1070 1340
7.0 148 271 415 591 790 1030 1300
7.2 140 258 398 568 762 994 1250
7.4 133 246 382 547 734 960 1210
7.6 125 234 366 527 708 928 1170
7.8 118 222 351 507 684 897 1130
8.0 111 210 336 488 660 868 1100
(Continued)