4.0 Local Transportation Analysis Requirements
4.1. Introduction
The local transportation analysis for the project involves the following activities:
- Operational and Queueing Analysis
- Construction Analysis
- Local Residential Street Cut-Through Analysis
- Additional Site Access Analysis
Details regarding the screening, analysis methodology, evaluation, and recommended corrective actions for each of these activities are provided below.
4.2. Operational and Queueing Analysis
The project's Traffic Impact Analysis (TIA) study should analyze the access and circulation constraints associated with the project site, addressing the needs of vehicular, transit, pedestrian, and bicycle systems. If necessary, the operational analysis should quantify the performance of primary site access locations, including unsignalized and signalized intersections, and any roadway segments identified in the Scoping Document.
4.2.1. Screening Criteria
Further analysis is required if:
- The project generates 250 or more daily trips.
- The project involves a discretionary action reviewed by the City of Inglewood Planning Division.
4.2.2. Study Area
Consult the Public Works Department to determine study locations, which should include:
- All primary project driveways
- Adjacent intersections and roadway segments integral to the project's access and circulation
- Additional intersections as deemed necessary by the Public Works Department
4.2.3. Data Collection and Study Periods
Collect intersection turning movement and roadway segment traffic counts during typical weekday peak periods (morning and evening), avoiding holidays, school vacations, and atypical conditions. Counts should be in 15-minute intervals and used for analysis. Additional data, such as travel times or speeds, may be needed for simulation analysis.
4.2.4. Scenarios
Analyze the following scenarios:
- Existing Conditions
- Existing plus Proposed Project Conditions
- Future Horizon Year without Project Conditions (usually the anticipated year of project occupancy)
- Future Horizon Year with Proposed Project Conditions
- Future Cumulative Horizon Year without Project Conditions
- Future Cumulative Horizon Year with Proposed Project Conditions
4.2.5. Future Traffic Estimation Methodology
Forecast future traffic conditions for the selected future years, including trips associated with related projects within a half-mile radius. Consult the Planning Division and other agencies to compile a related projects list. Add ambient growth and related projects traffic to existing traffic for future without project forecasts. Add proposed project traffic for future with project forecasts. The SCAG's RTP/SCS regional travel demand forecasting model or the Inglewood model may be used as required.
4.2.6. Traffic Generation, Distribution, and Assignment
Estimate trip generation using the latest ITE Trip Generation Manual. Consider the project's location, driveways, trip origins and destinations, existing traffic patterns, and regional system accessibility. Use approved trip distribution patterns to estimate project trips at all study locations.
4.2.7. Analysis Methodology
Use the latest Highway Capacity Manual (HCM) methodologies for intersection and roadway segment levels of service. Software such as Synchro, Vistro, or HCS may be used. For congested locations, operational analysis using Synchro/SimTraffic or VisSim micro-simulation software may be needed.
4.2.8. Evaluation
Evaluate the project's access and circulation system for:
- Backup of turning vehicles onto through lanes
- Spillover from turn pockets into through lanes
- Spillover into intersections
- Potential recurring congestion and gridlock
If these conditions are observed, corrective measures may be required.
4.2.9. Potential Corrective Actions
Corrective actions may include physical measures, traffic control modifications, and transportation demand management (TDM) measures, consistent with the California Manual of Uniform Traffic Control Devices (CA MUTCD) or other criteria. Potential measures include:
- Redesigning internal access and circulation
- Installing traffic control devices at project access locations
- Installing signage and striping internal to the site
- Restricting turns at site access locations
- Installing traffic control devices at nearby intersections
- Reconfiguring or improving intersections to reduce congestion and unsafe conflict points
- Preparing geometric design drawings for proposed improvements
- Ensuring all improvements are approved by the City and constructed or funded by the project developer
4.2.10. Transit Operations and Multi-modal Transportation Networks
Consult the Public Works Department, relevant agencies, and transit operators to obtain relevant data and comments on the project's impact on transit. Evaluate transit operations using quantitative and/or qualitative criteria, considering traffic congestion, delay re-entering the traffic stream, and passenger boarding delays.
Potential improvement measures include:
- Revising project size, use, and design to alleviate transit delays or hazardous conditions
- Paying a fair share of transit improvement costs
- Optimizing transit station/stop layout and connectivity
- Providing transit queue jump/bypass lanes
- Extending transit zones
- Contributing to the construction or enhancement of transit stations, stops, and transit centers
- Paying towards costs associated with projects and incentives encouraging transit usage
- Contributing to transit flow improvement projects, such as transit priority traffic signal systems and bus lanes
The City will determine the need for improvement measures based on the analysis.
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