. Introduction to Level of Service (LOS) Analysis
- Define LOS and its significance in transportation planning.
- Explain why municipalities, like the City of Montebello, require LOS analysis for proposed developments.
- Describe the impact of LOS analysis on urban planning and transportation infrastructure.
2. Role of Qualified Professionals
- Explain the requirement for a registered traffic engineer, civil engineer, or transportation planner to direct the analysis.
- Discuss the expertise these professionals bring to ensure accurate traffic projections and reliable data interpretation.
- Outline best practices for collaboration between the project applicant and City staff, emphasizing the importance of early scoping meetings.
3. Scope of Traffic Analysis
- Detail the steps to establish the study area and methodology.
- Discuss how specific factors, such as intersection proximity and traffic density, shape the study area and analysis methods.
- Provide examples of scenarios where a larger or smaller scope might be appropriate.
4. Criteria for Requiring LOS Analysis
- Examine each of the triggers for a transportation study, providing examples to clarify when these criteria apply.
- Example: Illustrate a situation where weekday AM or PM peak trips exceed 100, necessitating an LOS analysis.
- Emphasize the City Traffic Engineer’s discretionary role in cases where conditions warrant an analysis even if criteria aren’t met.
5. Traffic Counts: Methodology and Requirements
- Detail how traffic counts should be conducted, including the required timing, intervals, and conditions (weather, non-holiday periods).
- Explain the reason for counting intervals (e.g., 15 minutes) and how this improves data accuracy.
- Discuss the use of new vs. existing data, and criteria for when recent counts are deemed acceptable.
6. Trip Generation Analysis
- Explain trip generation rates and their role in transportation studies.
- Describe the Institute of Transportation Engineers (ITE) Trip Generation Manual, its significance, and when alternative data sources are permitted.
- Provide examples of trip generation credits, such as for transit or internal capture, and explain how they are calculated and justified.
7. Trip Distribution and Assignment
- Clarify trip distribution concepts and their basis in regional demographics and roadway system connectivity.
- Discuss how travel patterns, projected traffic, and future road network changes influence trip assignment.
- Provide an example of how demographic factors affect the projected number and direction of trips generated by a development.
8. Traffic Forecasting
- Describe the role of the Southern California Association of Governments (SCAG) Travel Demand Model in forecasting traffic conditions.
- Explain how cumulative traffic impacts, from both approved and planned projects, are incorporated into forecasts.
- Provide a case study showing how an analyst would handle cumulative traffic impacts in a high-growth area.
9. Defining the Study Area
- Detail the process of determining which intersections, roadway segments, and access points need analysis.
- Outline minimum requirements, like assessing adjacent roadways and intersections with 50 or more peak-hour trips.
- Provide an example of how to set a study boundary based on traffic generation, site location, and adjacent land uses.
10. Operations Analysis Methodologies
- Describe the methodologies for intersection and roadway segment analysis in the LOS evaluation.
- Intersection Analysis: Describe HCM methodology, peak hour factors, and pedestrian flow considerations.
- Roadway Segment Analysis: Discuss the volume-to-capacity (V/C) ratio and its use in segment analysis.
- Expand on how operational data is gathered and analyzed, including factors that influence traffic delay and flow.
11. Levels of Service (LOS) and Criteria
- Expand on Table 1 and Table 3 criteria, explaining each LOS designation for both intersections and roadway segments.
- Describe how each LOS level (A-F) reflects the operational efficiency and driver experience.
- Provide hypothetical examples of intersections at different LOS levels to illustrate various conditions (e.g., LOS F as extreme congestion).
12. Analysis Scenarios for LOS
- Explain each analysis scenario in detail:
- Existing Conditions: How to collect and validate recent data.
- Opening Year: How cumulative impacts of pending and approved developments are factored into analysis.
- Opening Year plus Project: Adding project-generated traffic and analyzing cumulative effects.
- Horizon Year and Horizon Year plus Project: Explain how build-out projections are used to simulate future traffic.
- Provide real-world examples for each scenario type, detailing the implications of each on project planning.
13. Transportation Effects and Mitigation Requirements
- Discuss conditions triggering mitigation measures for signalized and unsignalized intersections.
- Explain the criteria for adding signalization or modifying intersection design based on project impacts.
- Offer examples of potential improvements, like queue lengthening and signal timing adjustments, and outline how fair share costs for these improvements are calculated.
14. On-Site Parking Analysis
- Discuss requirements for analyzing parking needs, including how on-site supply should be compared to City code.
- Explain the concept of shared parking for mixed-use developments and how it can justify code reductions.
- Describe bicycle parking requirements as they apply to multimodal accessibility and sustainability goals.
15. Access and Circulation Analysis
- Detail the requirements for analyzing access points, driveway locations, and on-site vehicle circulation.
- Explain the need for proper spacing, signalization, queuing, and other considerations to ensure efficient and safe access.
- Provide examples of potential design adjustments that improve traffic flow and safety, like the addition of dedicated turn lanes or modifications to reduce turn conflicts.
16. Importance of LOS Analysis in City Planning
- Summarize the role of LOS analysis in supporting sustainable development, traffic management, and urban planning.
- Highlight how the guidelines align with broader City goals, such as improved mobility, safety, and environmental stewardship.
- Reflect on how these guidelines ensure that growth is well-supported by adequate infrastructure, minimizing adverse transportation impacts on existing communities.
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