Andover Unified Development Manual

Part 2 — Unified Development Ordinance Subdivision Regulations

City of Andover Unified Development Manual

D. Street Component Widths. 1. Traffic lanes may be from 10 to 14 feet wide, depending on function and design speed. 2. On-street parking lanes must be at least 8 feet wide. a. Up to 2 feet of gutter or shoulder may be included as part of the parking lane. 3. All types of curb-and-gutter must be at least 30 inches wide. 4. Rural roadway shoulders must be at least 3 feet wide. E. Street Curves. 1. Design street curves with the following minimum horizontal sight distances :

F. Roadway Grades. Longitudinal roadway grades must be at least 0.4 percent. 1. Where necessary, steeper grades may be required to provide adequate drainage. However, grades must not exceed the maximum percent grades noted in the following table:

Roadway Type

Maximum Percent Grade

Arterial Collector

6% 7% 7%


Frontage (Marginal Access)


2. Reasonable allowance will be made for vertical curves. 3. Exceptions must be approved by the applicable engineer. G. Minimum Intersection Curb Radius . Roadway pavement at intersections must have the following minimum curb radii:

Roadway Type Horizontal Sight Distance Arterial 500 feet Collector 300 feet Local 200 feet

Minimum Curb Radii

Type of Roadway Intersection Width

a. Measure the sight distance in the right-hand lane of the roadway, from a height of 4 feet 6 inches above the proposed pavement surface. 2. On arterial and collector streets, wherever possible, the inside tangent between reverse curves must be at least 100 feet long.

Local Residential Local Residential Local Residential

Local Residential

25 feet 30 feet 50 feet

Collector Arterial

Commercial/Industrial Collector or Arterial

Commercial/Industrial Collector or Arterial

50 feet

Main TOC

Subdivision TOC

Article 8 — page  of  11 12

Foster Design Associates LLC

Design Standards

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