Myths and Facts about Impacts of Freeway Lane Expansions on Traffic Congestion and Adoption Rates of Electric Vehicles
By Alan Pryor
Executive Summary
Proponents of the proposed DISC project claim that the projected traffic congestion associated with the project will be solved soon in the future by the hoped-for I-80 freeway HOV lane expansion easing roadway congestion. The proposed freeway expansion project envisions the addition of one HOV lane on each side of the I-80 freeway freeway from from Hwy 113 on the west to the I-5/I-50 interchange in Scaramento and the I-80/Reed Ave interchange to the east.
Proponents also claim that the associated vehicular greenhouse gas (GHG) emission from the increased traffic to and from the DISC site will be substantially eliminated by the mass adoption of electric vehicles reducing tailpipe GHG emissions
Unfortunately, science shows us that the proposed addition of the two HOV lanes on the 20.8 mile stretch of the I-80 freeway expansion (one HOV lane on each side of the freeway) will actually induce further traffic and Vehicle Miles Traveled (VMT) on this stretch of the freeway. Methodology developed by the UC Davis National Institute of Sustainable Transportation (NIST) shows this phenomena is due to both short and long-term driver behavioral changes including taking longer and more frequent automobile trips, route shifts, and transportation mode shifts away from public transportation. The cumulative impacts will result in no relief from the current plague of I-80 freeway congestion.
Further, mass adoption of electric vehicles will take decades to substantially replace existing aging fossil fuel-powered vehicles resulting in no near term decreases of the additional GHG emissions resulting from new traffic associated with the DISC project. These emissions directly threaten the Davis goal of carbon neutrality by 2040 and Yolo County's goal of net negative carbon emissions by 2030.
Myth #1 – The Proposed I-80 Expansion will Greatly Reduce Freeway Congestion for DISC Commuters Leading to Decreased Congestion for Local Drivers on Mace and Covell Blvd.










In regard to the Open Space and Habitat Commission meeting last [Monday] night, here are some highlights:
The recommendation (from the article linked above) to request that the northern (approximately) 100 acres be established as agricultural mitigation was not discussed or considered by the commission. Two commenters reiterated this request. (The 100 acres was part of prior proposals.)
The commissioners proceeded to review and edit the recommendations made when the proposal included the northern portion of the site. The developer representative claimed that many of them no longer applied, since the northern site is not part of the current iteration. As a result, the commissioners edited and deleted large sections of the prior recommendations, on-the-spot.
As the meeting approached 9:00 p.m., the chair suggested that a second meeting be held, given the amount of work left to be done. However, several commission members were not able to attend an additional meeting prior to the October 18th deadline set by the council. The chairperson stated that the council put the commission in a "bad place", and stated that she was "very unhappy" about it. The chair stated that they had received the packet for review on the previous Friday afternoon (for this Monday meeting).