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Project Location

Location of Cottonwood within Arizona, approximately two-thirds the distance from Phoenix to Flagstaff.

Intersection Aerial View

SR 260 goes south from the intersection. SR 89A goes east and west from the intersection.

Project Constraints

1. Must meet all applicable local, state and federal design standards
2. Must meet objectives specified in the Arizona Strategic Safety Plan
3. Should be on level terrain
4. Must improve vehicle, pedestrian, and cyclist safety by reducing the likelihood and frequency of crashes over the existing design
5. Must improve traffic mobility and efficiency over the existing design, such that the intersection operates at LOS C or above during peak-hour conditions
6. Must use the most cost-effective materials and building methods currently available

1. Must meet all applicable local, state and federal design standards
2. Must meet objectives specified in the Arizona Strategic Safety Plan
3. Should be on level terrain
4. Must improve vehicle, pedestrian, and cyclist safety by reducing the likelihood and frequency of crashes over the existing design
5. Must improve traffic mobility and efficiency over the existing design, such that the intersection operates at LOS C or above during peak-hour conditions
6. Must use the most cost-effective materials and building methods currently available

Project Tasks

Task 1.0: Research and Regulatory Considerations

Task 1.1: Review Past Solutions
Task 1.2: Regulatory Considerations
Task 1.2.1: Federal Highway Administration (FHWA)
Task 1.2.2 ADOT Roadway Design Guidelines

Task 2.0: Site Investigation

Task 2.1: Surveying and Soil Data
Task 2.2: Existing Geometry
Task 2.3: Identify Contributing Intersections
Task 2.4: Lane Configurations
Task 2.5: Site Restrictions
Task 2.6: Investigate Proposed Developments

Task 3.0: Collection of Traffic Data from ADOT

Task 3.1: Existing Plan Set
Task 3.2: Classification of Vehicles
Task 3.3: Five-Year Crash Data
Task 3.4: Signal Timing and Phasing

Task 4.0: Traffic Counts

Task 4.1: Field Safety Plan
Task 4.2: Peak Hour Volumes
Task 4.3: Upload Data

Task 5.0: Traffic Analysis

Task 5.1: Base Model Creation and Calibration
Task 5.2: VISSIM Analysis of Base Conditions
Task 5.3: 20-Year Projection

Task 6.0: Alternatives and Evaluation of Impacts

Task 6.1: Scoring System
Task 6.1.1: Design Criteria
Task 6.1.2: Construction Considerations
Task 6.1.3: Evaluation of Impacts
Task 6.2: Generate and Analyze Alternatives
Task 6.3: Scoring, Selection of Final Alternative
Task 6.4: Preliminary and Final Design Plan Sets

Task 7.0: Project Deliverables

Task 7.1: 30% Report and Presentation
Task 7.2: 60% Report and Presentation
Task 7.3: 90% Report
Task 7.4: Final Submittal
Task 7.5: Website

Task 8.0: Project Management

Task 8.1: Resource Management
Task 8.2: Client and TA Meetings
Task 8.3: GI Meetings
Task 8.4: Team Meetings
Task 8.5: Schedule Management

Staffing

The staffing document shows an inital work destribution for each role in this project to increase the effeciency for better results.

Engineering Costs

The engineering costs document shows the position for each member in this project and the estimated cost for each role in order to completely finish this project.

Schedule

The schedule was created to keep a up-to-date progress of the teams works and to keep the project on track.

Alternative Design

The alternative designs were created to improve the process of having better results that lead to the final design of the plan-set.

Decision Matrix

The decision matrix was created to analytically visualize the positive result numbers based on the traffic improvements.

All Plan sets

Detailed AutoCad drawings for the alternatives and final design. For construction and administrative use.

Final Design

The Final Design was selected among the created designs and it will be implemented D4 in the final results.