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One response to “Traffic delay scenarios should derail Christo”

  1. Fred is spot on in his editorial. In the DEIS section 4.16 , it states Traffic data from 2008 was collected from CDOT’s permanent traffic count station #000248, which is located west of Coaldale. The 2008 data was compared to similar 2005 data collected and reported in the Over the River Project Traffic Operations Analysis report prepared by David Evans and Associates, Inc.
    (June 2006). Comparing the 2005 traffic volumes to the 2008 traffic volumes shows there has been little to no growth in the Project Area. Therefore, the 2005 traffic volumes will be considered as the local existing background traffic so not to duplicate previous analysis.

    While the CDOT website’s FAQ states: Vehicle travel on Colorado State Highways increased by 59% between 1990 and 2008, from 17.7 billion vehicle miles of travel (VMT) to 28.1 billion VMT. Vehicle travel on Colorado State Highways is projected to increase by another 66% by 2035, to 46.7 billion vehicle miles of travel.

    We can extrapolate from the data that traffic from 2008 to 2013 will increase approximately 30%, which is a significant amount. The DEIS also states that there will be no significant impact from a 2 year long road construction project. Science demonstrates that when traffic is stopped at a lane closure, vehicle “waves” form. Traffic waves, also called stop waves or traffic shocks, are traveling disturbances in the distribution of cars on a highway. Traffic waves usually travel backwards in relation to the motion of the cars themselves, or “upstream” The waves can also travel downstream, but more commonly become “pinned” to a single spot on the road.

    Traffic waves are a type of traffic jam. A deeper understanding of traffic waves is a goal of the physical study of traffic flow. Traffic waves are common along construction areas, and of particular significance when a wave along a winding 2 lane highway catches a wave in front of it, which would be likely along US 50 given that 4 lane closures are possible along the 50 mile length. The waves then will coalesce into a wide moving jam. The average vehicle speed within the wide moving jams is much lower than the average speed in free flow, which is what the traffic modeling used in the DEIS ignores. At the downstream front the vehicles might accelerate to the free flow speed. At the upstream jam front the vehicles come from free flow or synchronized flow and must reduce their speed. Empirical results show, that some characteristic features of wide moving jams are independent of the traffic volume and bottleneck features (e.g. where and when the jam has emerged). However, these characteristic features are dependent on weather conditions, road conditions, vehicle technology, percentage of long vehicles, etc. As the DEIS does not take these items into account, and is using outdated data to make it’s predictions, the traffic section of the DEIS must be redone using current data extrapolated to the dates of construction and display / dismantling for analysis.

    Furthermore there is mention of a traffic management plan, which is yet to be developed. As traffic management is a crucial element of OTR, one of the most significant parts of the analysis of the projects feasibility or lack thereof, I submit that without this analysis detailing how traffic will be managed during the construction, display and 3 to 5 year reclamation phases, that it will be impossible to select a preferred alternative for what is a 6 to 8 year duration project other than the ‘no action’ alternative.

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