Vehicle-to-infrastructure emergency vehicle signal preemption application found to reduce emergency vehicle response time by 43 to 51 percent depending on traffic density. Results The simulation found significant EVRT savings. In a high-density area the method reduced EVRT by 50.94 percent, in a medium-density area the method reduced EVRT by 44.41 percent, and in theā¦ Content type Benefit Date Posted 03/23/2018 Taxonomy (ARC-IT) Emergency Vehicle Preemption (PS03) Geolocation links Toronto, Canada