Page 112 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

HIGHWAY LOCATION, DESIGN, AND TRAFFIC 95

TABLE 2.10 Minimum Radii for Design Speeds from 15 to 80 mi/h (24 to 129 km/h) and
Superelevation Rates to 10 Percent
eV 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)
1.5 947 1680 2420 3320 4350 5520 6830
2.0 694 1230 1780 2440 3210 4080 5050
2.2 625 1110 1600 2200 2900 3680 4570
2.4 567 1010 1460 2000 2640 3350 4160
2.6 517 916 1330 1840 2420 3080 3820
2.8 475 841 1230 1690 2230 2840 3520
3.0 438 777 1140 1570 2060 2630 3270
3.2 406 720 1050 1450 1920 2450 3040
3.4 377 670 978 1360 1790 2290 2850
3.6 352 625 913 1270 1680 2150 2670
3.8 329 584 856 1190 1580 2020 2510
4.0 308 547 804 1120 1490 1900 2370
4.2 289 514 756 1060 1400 1800 2240
4.4 271 483 713 994 1330 1700 2120
4.6 255 455 673 940 1260 1610 2020
4.8 240 429 636 890 1190 1530 1920
5.0 226 404 601 844 1130 1460 1830
5.2 213 381 569 802 1080 1390 1740
5.4 200 359 539 762 1030 1330 1660
5.6 188 339 511 724 974 1270 1590
5.8 176 319 484 689 929 1210 1520
6.0 164 299 458 656 886 1160 1460
6.2 152 280 433 624 846 1110 1400
6.4 140 260 409 594 808 1060 1340
6.6 130 242 386 564 772 1020 1290
6.8 120 226 363 536 737 971 1230
7.0 112 212 343 509 704 931 1190
7.2 105 199 324 483 671 892 1140
7.4 98 187 306 460 641 855 1100
7.6 92 176 290 437 612 820 1050
7.8 86 165 274 416 585 786 1010
8.0 81 156 260 396 558 754 968
8.2 76 147 246 377 533 722 930
8.4 72 139 234 359 509 692 893
8.6 68 131 221 341 486 662 856
8.8 64 124 209 324 463 633 820
9.0 60 116 198 307 440 604 784
9.2 56 109 186 291 418 574 748
9.4 52 102 175 274 395 545 710
9.6 48 95 163 256 370 513 671
9.8 44 87 150 236 343 477 625
10.0 36 72 126 200 292 410 540

(Continued)