Originally Posted by
AltheCyclist
Cough up the cash, recent story from my parts:
"A signalized intersection would cost about $2.7 million, city officials say. A roundabout likely would cost about $2 million more."
Article here
Idaho red-signal rule would be fine by me.
Raise you:
Probably the most comprehensive US study to date, the
Insurance Institute for Highway Safetycompleted an in depth study of 24 intersections -- in a mix of urban, suburban and rural environments, which had been converted from stop control and signals to modern roundabouts. (Crash Reduction Following Installation of Roundabouts in the United States, Insurance Institute for Highway Safety, Arlington, VA: Status Report, May, 2000.) This study reported reductions of 39 percent for all crash severities combined, 76 percent of all injury crashes and an approximate 90 percent in fatal and incapacity injury crashes.
http://www.azdot.gov/CCpartnerships/roundabouts/faq.asp
Also you're leaving out future maintenance costs, benefits to fuel savings and noise reduction, and no electrical cost.
So safer and cheaper over the long run.