Page 119 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

102 CHAPTER TWO

TABLE 2.12 Superelevation Rates and Runoff Lengths (ft) for Horizontal Curves on Low-Speed
Urban Streets Based on a Maximum Superelevation Rate of 4 Percent
Design speed, mi/h
20 25 30 35 40 45
Dc Radius, ft e L e L e L e L e L e L
d r d r d r d r d r d r
5°00 1146 NC — NC — NC — NC — NC — NC —
5°30 1042 NC — NC — NC — NC — NC — NC —
6°00 955 NC — NC — NC — NC — NC — RC 36
7°00 819 NC — NC — NC — NC — NC — .016 36
7°30 764 NC — NC — NC — NC — NC — .027 60
8°00 716 NC — NC — NC — NC — RC 33 .039 87
9°00 637 NC — NC — NC — NC — RC 33 8°00
9°30 603 NC — NC — NC — NC — .017 35 5°40
10°00 573 NC — NC — NC — NC — .027 56
10°30 546 NC — NC — NC — NC — .036 75
11°00 521 NC — NC — NC — NC — 10°45
11°30 498 NC — NC — NC — RC 31 7°42
12°00 458 NC — NC — NC — RC 31
13°00 441 NC — NC — NC — RC 31
14°00 409 NC — NC — NC — .020 39
15°00 382 NC — NC — NC — .035 68
15°30 370 NC — NC — NC — .040 78
17°00 337 NC — NC — NC — 15°30
17°30 327 NC — NC — NC — 11°28
18°00 318 NC — NC — RC 30
20°00 286 NC — NC — RC 30
20°30 279 NC — NC — .016 30
21°00 273 NC — NC — .021 39
22°00 260 NC — NC — .031 57
22°45 252 NC — NC — .039 72
25°00 229 NC — NC — 22°45
29°00 198 NC — NC —
29°30 194 NC — RC 28 17°30
30°00 191 NC — RC 28
33°00 174 NC — RC 28
33°45 170 NC — .016 28
35°00 164 NC — .025 43
36°00 159 NC — .033 57
37°00 155 NC — .040 69
40°00 143 NC — 37°00
50°00 116 NC — 29°20
54°30 105 RC 26
56°00 102 RC 26
NC Normal crown
58°00 99 RC 26
RC Remove crown
61°00 94 RC 26 e Design superelevation rate
61°15 93 .016 26 d
62°00 92 .020 32 L minimum runoff length, 12-foot wide Lane
r
rotated about the centerline
63°00 91 .024 39 Maximum degree of curve for the design
64°00 90 .029 47 speed
65°00 88 .034 55 Maximum degree of curve for normal crown
66°00 87 .038 62 66°30
66°30 86 .040 65 54°23
Conversions: 1 mi/h 1.609 km/h, 1 ft 0.305 m.
Source: Location and Design Manual, Vol. 1, Roadway Design, Ohio Department of Transportation, with
permission.