Transportation Impact Analysis

Hexagon staff has prepared well over 500 Transportation Impact Analysis (TIA) reports and Circulation sections of EIRs for all types of new development in numerous jurisdictions. The projects have ranged from as small as one gas station or five houses to as large as 10 million square feet of research and development space (Edenvale area of San Jose) or 3,000 homes (Evergreen Specific Plan). The most common types of new development that we analyze are residential subdivisions, apartment buildings, schools, hotels, offices, and shopping centers. Shopping centers range from small neighborhood centers with grocery store anchors up to super regional malls with four department stores and over one million square feet. Other developments Hexagon staff has studied include theaters (live and cinema), health clubs, parks, golf courses, day care centers, restaurants, warehouses, gas stations, churches, hospitals, medical buildings, a city hall, a fire station, and even a sanitary landfill. 

Transportation Impact Studies typically include extensive intersection and roadway traffic counts as well as intersection level of service analyses. Hexagon staff is fully familiar with all types of Level of Service software and is experienced with databases ranging from 1 to 140 intersections. All Transportation Impact Studies include an analysis of pedestrian, bicycle, and transit issues and recommendations for improvements, if necessary, and many also include an evaluation of roadway safety. These typically include accident diagnosis, computation of accident rates and recommendations for potential improvements.

Transportation impact analyses are almost always prepared at the direction of city or county staff. We have worked with city and county staff in every county and almost every city in the San Francisco Bay Area. All TIAs involve traffic data collection and analysis using the techniques that are accepted in the county and city where the project is located. Hexagon staff is sensitive to local traffic issues and local preferences. It is our policy to always research local standards and practices prior to initiating a study.

Transportation Impact Studies in California are evolving with CEQA requirements under SB 743, specifically to provide an alternative to Level of Service for evaluating transportation impacts. Measurements of transportation impacts will soon be defined by vehicle miles traveled (VMT), which will account for impacts beyond traffic congestion including air quality, noise, and safety. Hexagon has experience producing TIAs with a greater focus on the changes related to SB 743 and an increased focus and awareness of transit, bicycle, and pedestrian facilities and operations.