Here is an article from Binghamton, NY briefly discussing the political posturing over putting a roundabout in their downtown. Apparently the local business owners believe the roundabout may kill their businesses.
Reconstructing streets in downtown areas is often an economic negative for the business owners. When I was an intern for the City of St. Paul about fifteen years ago, a coffee shop owner got a fair amount of press for coming out and throwing donuts at the equipment reconstructing the street in front of the restaurant. The coffee shop ended up closing.
Setting aside the economic downturn suffered during construction, I am wondering if anyone has studied the economic impacts on businesses of roundabouts versus traffic signals. I haven't come across such a study.
I occasionally cite research done by Iowa State that points to the economic impacts of limiting driveways. It is helpful to have research to fall back on instead of arguing about opinions. I would like to have research to cite on the roundabout/traffic signal economic debate. Any academics out there that can take this up?