Roundabouts reduce casualty crashes by around 75%, but conventional traffic signals only reduce casualty crashes by around 45%. But why not have both?  
It is quite common for roundabouts to be replaced with traffic signals when the opposing movements become too great, but traffic signals induce high speed harsh angle crashes compared to the slower friendlier crashes that occur at roundabouts (see video below).  
Before you remove a roundabout, have you considered signalising (metering) it? Signalised roundabouts significantly improve the capacity of the roundabout and retain all (and sometimes more) of the safety benefits. 
Signalised/metered roundabouts can also provide a nice crossing facility for pedestrians and cyclists. 
The site in this clip is in Melbourne, Victoria (intersection of Mickleham Road and Melrose Drive, Tullamarine)