On an annual basis, our staff plan-checks and prepares numerous traffic operations analysis reports and traffic device warrant reports for various city agencies, such as operational level-of-service (LOS), traffic signal warrants, left-turn phasing warrants, queuing analyses, multiway stop warrants, flashing beacon warrants, in-roadway warning light warrants, traffic calming studies, engineering and traffic surveys for establishing speed limits, etc. HCI staff has obtained and analyzed data, prepared exhibits, and developed reports for literally hundreds of traffic device warrant studies.

Approach

Our approach to requested analyses typically starts with a field-review and collecting traffic count data. Upon completion of these initial tasks, HCI applies all data gathered for the project intersection or street segment to the guidelines contained in the State of California Manual on Uniform Traffic Control Devices (CA MUTCD), California Vehicle Code (CVC), and ITE Traffic Engineering Handbook.

HCI completes a draft summary report containing our findings and recommendations relative to possible installation/modification and submit to the local agency for review. After incorporating any comments, HCI re-submits a final report summarizing the results of the study. The reports are suitably documented with text, tabular and graphical material, along with a summary of results and recommendations.

In relation, HCI has prepared numerous grant applications that include traffic device warrants for our client cities. HCI has worked with local agency staffs to identify potential improvement projects that meet the criteria of the grants. Two types of grants that are issued practically on yearly basis are the Safe Route to Schools (SRTS) grant and Highway Safety Improvement Program (HSIP) grant. HCI is very familiar with the requirements of these two grants.

Additionally, HCI provides critical intersection calculations to several of our client city agencies on a bi-annual basis for compliance with the region’s Congestion Management Program (CMP) and Highway Performance Monitoring System (HPMS). In regards to the CMP, HCI gathers peak-hour turning movement count data for the specified intersections, and applies these traffic volumes, number of lanes for each approach leg, and timing to obtain an intersection LOS. More specifically, HCI utilizes the Intersection Capacity Utilization (ICU) or the Highway Capacity Manual (HCM) methodologies, as appropriate, to complete peak-hour intersection level-of-service (LOS) calculations. Typically, HCI uses the HCM methodology to determine LOS at traffic signalized intersections using the Synchro Traffic Signal software, unless the ICU methodology is specified. HCI then reviews the results, determines applicable deficiencies, and provides recommendations to the City/County for improving LOS to acceptable standards, such as signal modifications for additional lanes, protected left-turns, overlap phases, and improved signal timing.