Page 110 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

HIGHWAY LOCATION, DESIGN, AND TRAFFIC 93

TABLE 2.9 Minimum Radii for Design Speeds from 15 to 80 mi/h (24 to 129 km/h) and
Superelevation Rates to 8 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)
1.5 932 1640 2370 3240 4260 5410 6710
2.0 676 1190 1720 2370 3120 3970 4930
2.2 605 1070 1550 2130 2800 3570 4440
2.4 546 959 1400 1930 2540 3240 4030
2.6 496 872 1280 1760 2320 2960 3690
2.8 453 796 1170 1610 2130 2720 3390
3.0 415 730 1070 1480 1960 2510 3130
3.2 382 672 985 1370 1820 2330 2900
3.4 352 620 911 1270 1690 2170 2700
3.6 324 572 845 1180 1570 2020 2520
3.8 300 530 784 1100 1470 1890 2360
4.0 277 490 729 1030 1370 1770 2220
4.2 255 453 678 955 1280 1660 2080
4.4 235 418 630 893 1200 1560 1960
4.6 215 384 585 834 1130 1470 1850
4.8 193 349 542 779 1060 1390 1750
5.0 172 314 499 727 991 1310 1650
5.2 154 284 457 676 929 1230 1560
5.4 139 258 420 627 870 1160 1480
5.6 126 236 387 582 813 1090 1390
5.8 115 216 358 542 761 1030 1320
6.0 105 199 332 506 713 965 1250
6.2 97 184 308 472 669 909 1180
6.4 89 170 287 442 628 857 1110
6.6 82 157 267 413 590 808 1050
6.8 76 146 248 386 553 761 990
7.0 70 135 231 360 518 716 933
7.2 64 125 214 336 485 672 878
7.4 59 115 198 312 451 628 822
7.6 54 105 182 287 417 583 765
7.8 48 94 164 261 380 533 701
8.0 38 76 134 214 314 444 587
(Continued)