The design of urban roads from limited local residential streets to arterial road standards. Horizontal and vertical alignment applications are detailed; consideration is given to drainage and auxiliary facilities such as parking, sidewalks and bus services. Students are required to incorporate all design elements in preparation for design drawings of a section of urban arterial road including intersection design.
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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
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