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Abstract
This research addressed two questions: “Are roundabouts on rural high-speed roadways safer than
two-way stop controlled (TWSC) intersections?” and “What economic benefits can be expected
from converting TWSC intersections to roundabouts in terms of safety improvement?” Crash
and traffic data on four TWSC intersections that were converted to roundabouts in Kansas were
analyzed using the empirical Bayes before-after evaluation method and crash costs were applied
to evaluate economic benefits. Analysis showed that fatal, non-fatal, and property-damage-only
crashes were reduced by 100%, 76.47%, and 35.49%, respectively. The annual monetary value from
this reduction was between $1.0—$1.6 million in 2014 dollars.