Posts Tagged ‘2020’

October 21, 2020 NorCal ITE Meeting

Posted on: October 13th, 2020 by iteadmin No Comments
Flashing Yellow Arrow (FYA) Presentation

  Description

Flashing Yellow Arrow (FYA) is a signal phasing strategy that is widely used throughout the country which offers drivers the ability to make a permissive left-turn movement in a protected/permissive (or permissive only) operation. Vehicular traffic facing a FYA signal indication is permitted to cautiously enter the intersection to make the movement indicated by the arrow. While permissive left-turn operation has been more commonly facilitated with a green ball signal indication, this treatment presents safety concerns as drivers inadvertently mistake the green ball indication as implying the left-turn has the right-of-way over opposing traffic. Research and experimentation conducted by Federal Highway Administration (FHWA), among other organizations, has demonstrated that the FYA signal indication is an effective alternative to the green ball to indicate a permissive left turn movement. It offers several advantages from a safety and traffic operations standpoint. The City of Roseville has led the way in the region with deployment of FYAs with their pilot project at the intersection of Industrial Avenue and Freedom Way in 2016. Since then the City has converted several additional intersections from protected left-turns to protected/permissive operation with FYAs. The City of Elk Grove recently completed its FYA pilot project, also converting three signals from protected left-turns to protected/permissive operation with FYAs. Other agencies in the Sacramento region are also considering FYA deployments. This presentation will include/focus on safety and operational benefits, current deployments in the Sacramento region, evaluation results, public outreach, and lessons learned.

Time: 11:30am to 1:00pm

Location: Zoom Meeting

Cost: FREE!

September 16, 2020 ITE Meeting

Posted on: September 1st, 2020 by iteadmin No Comments

Sacramento County Flexible Mitigation Strategy

> View Presentation Slides

Description

Like many jurisdictions, Sacramento County has historically conditioned development to implement roadway improvements and mitigations tied to a specific number of dwelling units. While this approach has been effective on smaller scale developments, it does not always dictate the appropriate timing and location of improvements for large Specific Plans. The County has developed a flexible mitigation strategy attuned to the actual location of development. For any amount of phased development that might be implemented, a spreadsheet “dynamic implementation tool” estimates the trip assignment and determines if the growth would trigger an impact, based on significance thresholds. Calculations in the tool are based on outputs from the SACSIM model used for the traffic impact analysis. The model tracks the origin and destination of each trip end by traffic analysis zones, which are aggregated to larger districts. Select link analysis determines the fair share allocation of volume growth to each district. Based on the amount of development assumed and entered into the tool by district, VMT-based trip rates are applied to estimate volume increases through each segment and intersection. With this information, a nexus can be established between a phasing concept and infrastructure needs without the costly and time-consuming process of rerunning the demand model. This approach gives developers flexibility with project phasing and optimization, while ensuring that deficiencies are expeditiously addressed. The County has the tools to proactively monitor and manage the transportation network, ensuring transportation funds are spent where they are needed.

Time: 11:30am to 1:00pm

Location: Zoom Meeting

Cost: FREE!