Functional Class | Major Arterial(a) | Minor Arterial(a) | Major Collector(a) | Minor Collector | Local |
Functional Class | Major Arterial(a) | Minor Arterial(a) | Major Collector(a) | Minor Collector | Local |
Design Hour Volume, DHV | Over 2,000 | Less than 2,000 | 900-1,800 | Less than 900 | Generally less than 500 |
Operating speed, mph | 35-45 | 25-35 | 20-30 | 20-30 | 20-30 |
No. of traffic lanes and width, ft. | 4 or 6@12(b) | 4@12(b) | 3@12(b) | 2@18(b) to 4@12(b) | 2@12(b) to 3@12(b) |
Median width, ft. | 14 ft. Min. to 30 ft. Des. | None | None | None | None |
Min. right-of-way, ft. | 120-220 | 100 | 70 | 60-100 | 50-70 |
Gradient, max. percent | 4 | 4 | 5 | 4-8 | 4-10 |
Min. centerline radius, ft. | 575 | 350 | 250 | 150-275 | 115-200 |
Min. stopping sight dist., ft. | 275(c) | 275 | 275 | 150-275 | 115-200 |
Curbing | Barrier | Barrier | Barrier | Barrier | Barrier |
Min. curb return radius, ft. | 30 | 30 | 30 | 20(d) | 15 |
Min. intersection angle, deg. | 75 | 75 | 75 | 75 | 75 |
Min. street jog, ft. | N/A | N/A | N/A | N/A | 150 |
Min. width of sidewalks, ft. | 5 | 5 | 5 | 4-5 | 4-5 |
Max. cul-de-sac length, ft. | N/A | N/A | N/A | 1000(e) | 600 |
Min. cul-de-sac length, ft. | N/A | N/A | N/A | 50(e) | 40 |
Access control | None | None | None | None | None |
(a) Refer to arterial designations of the Thoroughfare Plan and Table 2. In the case of Major Collector (Type C) facilities located in high density residentially zoned areas or areas with industrial, commercial, or office zoning, the Town Engineer may require the Minor Arterial design standards be followed.
(b) Through traffic lanes only. Auxiliary lanes, including parking, are not included. Auxiliary lanes for right- or left-turn are 12 ft. in width except undivided arterials where left-turn lanes are 14 ft. Lanes widths exclude 2 ft. curb and gutter section.
(c) 325 feet desirable.
(d) 20 ft. radius for residential areas only. For industrial, commercial, or office areas, the radius is a minimum of 30 ft.
(e) Cul-de-sacs allowed for industrial-commercial areas only to encourage development in otherwise unsuitable plats.
(Ord. 93-Z-03, passed - - )