Parking & Driveways 9.8 Driveway Access
9
Design Speed (mph)
Length of Sight Distance (ft)
15 20 25 30 35 40 45 50 55 60 65
70 90
115 140 165 195 220 245 285 325 365
2. For roadway grades >3%, the following table shall be used. All distances are shown in feet perpendicular to the decision point.
Design Speed (mph)
Approach Grade (%)
15
20
25
30
35
40
45
50
55
60
-6
77
99
126.5
154
181.5
214.5
242
294
342
390
-5
70
90
126.5
154
181.5
214.5
242
269.5
313.5
357.5
-4
70
90
115
154
181.5
214.5
242
269.5
313.5
357.5
-3 to +3
70
90
115
140
165
175.5
198
220.5
256.5
325
4
70
90
115
140
148.5
175.5
198
220.5
256.5
292.5
5
70
90
115
126
148.5
175.5
198
220.5
256.5
292.5
6
70
90
103.5
126
148.5
175.5
198
220.5
256.5
292.5
Town of Wake Forest Unified Development Ordinance – July 19, 2022
9-16
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