Subdivision Planning/Design Part 2: Urban Street Design TSYH 4532

Upon successful completion, the student will be able to:

Module 1 - Road Classification and Servicing Requirements

• Classify urban roadways and the relationship of pavement width to right-of-way width.
• State and define the purpose and characteristics of each class of roadway.
• State and discuss the other facilities provided within a normal road allowance.

Module 2 - Preparation of Plan and Profile Drawings

• State and define the basic preparation required and organization of a set of project drawings.
• Adopt a legend, prepare cross sections and incorporate standard notes.
• State specific information that should be shown on the plan and profile drawings.
• Prepare supplementary detail design information.

Module 3 - Preliminary Design Review

• Determine the extent of field information required and the need to confirm details of existing utilities.
• Obtain and interpret legal plan information for existing adjacent road right-of-way widths.
• Interpret existing design criteria and propose accepted criteria to complete the required guidelines where necessary.
• Examine the proposed and future utility requirements and evaluate the impact of future development proposals.
• Identify the need for any special structures that may be required, such as bridges or large culverts.

Module 4 - Horizontal Alignment Elements

• Prepare a plan view of the location of the proposed pavement for full roads, half-roads and laneways.
• State and define the terminology of horizontal curve configurations.
• Compute and present data defining the horizontal alignment including cul-de-sacs and curb returns.
• Determine adequate stopping and sight line distances for curves that may also incorporate vertical curve alignments.
• Utilize standard methods of incorporating vehicle 'turn-around' facilities.

Module 5 - Vertical Alignment Elements

• Define the criteria used in developing vertical alignment standards and its application to vertical curvature.
• Establish accepted maximum and minimum gradients and points of vertical intersection (V.P.I.)
• Determine the appropriate length of vertical curve for both crest and sag curves based on acceptable 'K' values.
• Compute the elevations along a vertical curve together with the preparation and the recording of the design data.
• Integrate vertical curves at intersections and a review of the vertical design considerations.

Module 6 - Road Cross-sections and Entrance Configurations

• Illustrate typical cross-section details for a variety of urban road standards including lanes and cul-de-sacs.
• Describe various methods of controlling surface drainage by utilizing crossfall techniques to provide a cost effective design.
• Identify different types of curbs, medians, and islands which may also incorporate parking facilities.
• Prepare standard cross-sections showing existing and proposed conditions and their relationship for quantity estimates.
• Illustrate recommended locations for driveway entrances for commercial/corner store developments, bus bays and driveways.

Module 7 - Urban Road Design Example

• Interpret urban road project design requirements and specifications.
• Prepare elevation tables, minimum vertical curve tables and design data sheets.
• Analyze horizontal alignment criteria and compute horizontal curve data.
• Calculate total project stationing from horizontal alignment data.
• Develop typical and special road cross sections.
• Design urban road vertical alignments based on specifications and controls.
• Calculate vertical curve data.
• Prepare trial plan and profile, and working cross sections drawings.

Module 8 - Intersection Design

• Determine the relative safety and efficiency of various types of intersections and establish methods of improving poor intersection layouts.
• Establish the priority of the design criteria through the intersection in accordance with the road classification and objectives of the intersection.
• Revise vertical alignment characteristics and incorporate one-way crossfalls to improve the riding quality of the intersection.
• Establish the desired radius of the curb return and prepare profiles along the curb returns to ensure adequate drainage.

Module 9 - Road Drainage Concepts

• Determine the location and spacing of catchbasins based on hydraulic capacity and pedestrian considerations.
• Incorporate major flood path routing to control surface runoff during adverse storm conditions.
• Estimate the flow capacity of a roadway, protection of private property and provision for emergency vehicles.
• Design roads based on gutter drainage profiles.

Effective as of Fall 2003