Page 109 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

92 CHAPTER TWO

TABLE 2.8 Minimum Radii for Design Speeds from 15 to 80 mi/h (24 to 129 km/h) and
Superelevation Rates to 6 Percent (Continued)
e V 50 mi/h V 55 mi/h V 60 mi/h V 65 mi/h V 70 mi/h V 75 mi/h V 80 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 7870 9410 11100 12600 14100 15700 17400
2.0 5700 6820 8060 9130 10300 11500 12900
2.2 5100 6110 7230 8200 9240 10400 11600
2.4 4600 5520 6540 7430 8380 9420 10600
2.6 4170 5020 5950 6770 7660 8620 9670
2.8 3800 4580 5440 6200 7030 7930 8910
3.0 3480 4200 4990 5710 6490 7330 8260
3.2 3200 3860 4600 5280 6010 6810 7680
3.4 2940 3560 4250 4890 5580 6340 7180
3.6 2710 3290 3940 4540 5210 5930 6720
3.8 2490 3040 3650 4230 4860 5560 6320
4.0 2300 2810 3390 3950 4550 5220 5950
4.2 2110 2590 3140 3680 4270 4910 5620
4.4 1940 2400 2920 3440 4010 4630 5320
4.6 1780 2210 2710 3220 3770 4380 5040
4.8 1640 2050 2510 3000 3550 4140 4790
5.0 1510 1890 2330 2800 3330 3910 4550
5.2 1390 1750 2160 2610 3120 3690 4320
5.4 1280 1610 1990 2420 2910 3460 4090
5.6 1160 1470 1830 2230 2700 3230 3840
5.8 1040 1320 1650 2020 2460 2970 3560
6.0 833 1060 1330 1660 2040 2500 3050
Conversions: 1 mi/h 1.609 km/h, 1 ft 0.305 m.
R radius of curve
V design speed
d
e rate of superelevation
Source: A Policy on Geometric Design of Highways and Streets, American Association of State Highway
and Transportation Officials, Washington, D.C., 2004, with permission.