Page 111 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

94 CHAPTER TWO

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 (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 8150 9720 11500 12900 14500 16100 17800
2.0 5990 7150 8440 9510 10700 12000 13300
2.2 5400 6450 7620 8600 9660 10800 12000
2.4 4910 5870 6930 7830 8810 9850 11000
2.6 4490 5370 6350 7180 8090 9050 10100
2.8 4130 4950 5850 6630 7470 8370 9340
3.0 3820 4580 5420 6140 6930 7780 8700
3.2 3550 4250 5040 5720 6460 7260 8130
3.4 3300 3970 4700 5350 6050 6800 7620
3.6 3090 3710 4400 5010 5680 6400 7180
3.8 2890 3480 4140 4710 5350 6030 6780
4.0 2720 3270 3890 4450 5050 5710 6420
4.2 2560 3080 3670 4200 4780 5410 6090
4.4 2410 2910 3470 3980 4540 5140 5800
4.6 2280 2750 3290 3770 4310 4890 5530
4.8 2160 2610 3120 3590 4100 4670 5280
5.0 2040 2470 2960 3410 3910 4460 5050
5.2 1930 2350 2820 3250 3740 4260 4840
5.4 1830 2230 2680 3110 3570 4090 4640
5.6 1740 2120 2550 2970 3420 3920 4460
5.8 1650 2010 2430 2840 3280 3760 4290
6.0 1560 1920 2320 2710 3150 3620 4140
6.2 1480 1820 2210 2600 3020 3480 3990
6.4 1400 1730 2110 2490 2910 3360 3850
6.6 1330 1650 2010 2380 2790 3240 3720
6.8 1260 1560 1910 2280 2690 3120 3600
7.0 1190 1480 1820 2180 2580 3010 3480
7.2 1120 1400 1720 2070 2470 2900 3370
7.4 1060 1320 1630 1970 2350 2780 3250
7.6 980 1230 1530 1850 2230 2650 3120
7.8 901 1140 1410 1720 2090 2500 2970
8.0 758 960 1200 1480 1810 2210 2670
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.