Development of VSL Algorithms on I‐25 and I‐70 | TIM on I-70 | Development of Meaningful Metrics
Friday, April 19, 2019
9:20 a.m. - 10:20 a.m. MDT
CM | 1Add to My Log
Development of VSL Algorithms on I‐25 Gap Project and I‐70 West: Empirical examination of the relationship between flow/density, speed and crash rate on freeways in Colorado suggests that as flow/density increases crash rate initially remains constant until a certain critical threshold combination of speed and density is reached. Once this threshold is exceeded the crash rate rapidly rises. The rise in crash rate is explained by the fact that compression of flow without notable reduction in speed produces headways so small that it becomes very difficult or impossible to compensate for driver’s error to avoid a crash. It stands to reason that slowing traffic down in real time via displays on Variable Speed Limit (VSL) signs in advance of reaching this threshold have potential to improve safety and travel time reliability. This presentation will explain how safety performance based VSL algorithms were developed for I‐25 Gap Project and I‐70 West.
Learning Objectives: 1) Understand Relationships between flow parameters and safety Development of Variable Speed Limit Algorithms; 2) Specifics of VSL algorithms development on I‐25 Gap Project and I‐70 West
Traffic incident Management on I-70 in Eastern Colorado: I‐70 in Eastern Colorado experiences crashes, Rollovers and wind events more than you would expect. I have taken over this section from Region 1 and have united the first responders on the local level to understand TIM's and to place these practices into actions.
Learning Objectives: 1) Buy in form the locals ‐ What's in it for me?; 2) Communication and collaboration ‐ the A ha moment!; 3) Safety and mobility of the first responders and the mobility of the Interstate
Development of Meaningful Metrics for Safety, Mobility, and Accessibility in the Era of Vision Zero: Vision Zero report cards often list various transportation improvements that address community objectives such as building curb ramps or projects that address cycling comfort. These types of efforts, albeit important, may not specifically ‘move the needle’ on crash numbers. This session will discuss how to report metrics for Vision Zero and create meaningful parallel programs to quantify mobility and accessibility objectives.
Learning Objectives: 1) Learn about Vision Zero efforts; 2) Learn about trends in Vision Zero programs that may not ‘move the needle’; 3)Learn about ways to capture and report important improvements to accessibility and mobility
Shelia Booth, firstname.lastname@example.org