....If everyone would follow the signs and lights as they are supposed to, there would be no need for circles.
"And you put your trust entirely in the what others are to supposed to do?"
Occasionally, we have to think rationally.
An effort to eliminate head on collisions is justification enough for the roundabout/traffic circle (RATC)...No brainer!
So beyond that goal, are the additional needs for society to reduce pollution, save energy, use its public safety departments more effectively, reduce the bureaucracy associated with vehicle accidents, control the rising costs of insurance, mitigate the residual impact to other motorists not involved in the accident (backups/delays), etc.
It is remarkable how facts and opinions changed before and after a RATC is implemented in a traffic network -
https://www.wsdot.wa...ts/benefits.htm
https://www.wsdot.wa...uts/opinion.htm