LLG has extensive experience in the preparation of operational analyses for intersections and roadway segments. We have produced many before and after type analyses using the Synchro, HCS, Vistro, aaSidra, and TransModeler software packages and other industry-accepted traffic modeling programs to demonstrate the effects associated with street improvement as well as traffic signal installation and modification projects. Our firm possesses the capability to prepare traffic simulation models which simulate and evaluate operating conditions for an individual intersection, a series of intersections through a travel corridor, as well as on an area-wide roadway system basis. We have prepared numerous operational analyses and simulation models for jurisdictions throughout the Southern California region.
LLG believes that operational analyses allow Clients to see through an engineer’s eyes and understand how their roadway modifications can alter traffic flows in simulated real-time conditions. At LLG, we believe that having our Clients understand our designs is just as important as the designs themselves. We strive to bring our Clients and the general public to a higher level of understanding in every way possible. Operational analyses and simulation models are just a couple of ways we achieve this.
- Coordination and Optimization of Signal Timing
- Adaptive Signals
- CORSIM and HCS Modeling
- Signal Actuation
- Synchro/SimTraffic Simulation
- Time-Space Diagrams
- Controller Interface (CI) Simulation
- Freeway Operations
- Traffic Safety Review
- Traffic Signal Warrant Analyses
- Turn Pocket Design/Queue
LLG prepared a comprehensive traffic study and parking assessment for the Escondido Ballpark project, designed primarily for AAA minor league baseball. The project is particularly unique as a special event land use that generates primarily off-peak traffic. As such, special consideration was given to the analysis approach and methodologies to ensure technical accuracy and best capture potential project impacts. The traffic study analyzed numerous intersections, street segments, and freeway segments, under existing, near-term and long-term conditions. Through extensive coordination between the City, SANDAG, NCTD and LLG, horizon year traffic volumes were forecast for the study area. The modeling included detailed land use/roadway network information from the City of Escondido’s General Plan, General Plan Amendments (GPAs), and cumulative projects.
San Diego, CA
LLG has been responsible for over twenty (20) on-call task orders within Caltrans District. These task orders drew upon the wide variety of traffic engineering capabilities that LLG possesses. The more prominent task orders are outlined below:
I-5/SR 78 Interchange & Direct Connectors
I-5/SR 56 Interchange
I-5/I-8 Interchange & Direct Connector
SR 52, Stage 4 & 5
SR 98 East By-Pass
SR 98 Widening
Santee PUC Application
San Diego, CA
Linscott, Law and Greenspan, Engineers (LLG) was an on-call traffic engineer for the San Diego Regional Airport Authority. The responsibilities included traffic engineering design, traffic control, street lighting, and safety. LLG has prepared numerous traffic studies, traffic engineering and traffic control design plans for several Airport Authority projects. Plan sets include all City of San Diego and Caltrans’ requirements for design. The traffic control design focus has been to provide an area of work that is safe and allows traffic to continue using the travel lanes efficiently. Projects included the Lot 8 expansion, speed bump installation at Terminal 2, pedestrian crosswalk safety at Terminal 1, Rent-a-Car Access road improvements, and Winship Lane improvements.
San Diego, CA
LLG prepared a comprehensive traffic study for the University Towne Centre (UTC) Renovation project, located in University City community of the City of San Diego. UTC, originally opened in 1977, serves as a regional shopping center. The redevelopment project included the development of 750,000 square feet of commercial retail and 250 multi-family units. The project was processed as a Master Planned Development Plan, and seven alternative projects were also considered. The scope of the study area included analysis of 59 intersections, 70 street segments, 10 ramp meters, and 9 freeway segments. Analysis of all facilities for the existing, near-term and horizon year time frames was conducted. A comprehensive modeling effort was undertaken, and traffic from other projects in the vicinity was considered.
San Diego, CA
The project included a hotel, a residential component and an increase in full-time equivalent student (FTE) to 35,000. The project is calculated to generate about 11,000 ADT. Numerous intersection and street segments in the project area were analyzed for the existing, existing + cumulative and existing + cumulative + project scenarios. In addition, a Year 2030 with and without project analysis was completed. The analysis included an assessment of freeways and ramp meters. Significant impacts were determined and mitigation was recommended.
San Bernardino County, CA
Linscott, Law & Greenspan Engineers (LLG) prepared a traffic study for the Expansion of the Morongo Casino. The traffic study recommended installing a pair of roundabouts at the I-10 / Apache Trail interchange to mitigate project impacts. The westbound ramps intersection is a six-leg roundabout, including the off and on-ramps, Apache Trail and the frontage road (Seminole Drive). The eastbound ramps intersection is a five-leg roundabout including the eastbound off and on-ramps, Apache Trail and the frontage road (Main Street), with a railroad crossing south of the roundabout. LLG prepared detailed designs for roundabouts at the two ramp intersections and processed the plans for Caltrans approval.