A micro-simulation model (VISSIM) was used to estimate the impacts of automated vehicles (AV) across a range of adoption rates.
Statewide, Iowa, United States
Interstate 80 Automated Corridor
Summary Information
The Iowa Department of Transportation performed an analysis to understand the future of automated vehicle (AV) adoption, and how such vehicles may be accounted for in the agency’s vision of the I-80 corridor. Researchers examined a range of scenarios for future AV adoption rates and considered how the benefits of AVs could be incorporated into future-facing designs for I-80. The overall intent was to allow the design to be flexible for a broad range of potential AV futures, while still meeting the corridor's needs in the present day. The researchers also performed analyses of how traffic capacity, road safety, and travel time would be affected by different proportions of AV adoption. The analyses were performed using a VISSIM traffic micro-simulation model, incorporating both the specific patterns of the I-80 corridor and the particular abilities enabled by V2I technologies.
FINDINGS
At a 25 percent AV adoption rate, the analysis found a reduction in the incidence of total crashes of approximately 20 percent. At a 85 percent adoption rate, this reduction was approximately 65 percent. The reduction was greatest for crashes that resulted only in property damage; however, even fatal or incapacitating crashes found a reduction of approximately 45 percent.
