> They are a liability when traffic levels are high enough - say during peak times - when one inbound direction is blocked by another. It is possible to add tr

> They are a liability when traffic levels are high enough - say during peak times - when one inbound direction is blocked by another. It is possible to add traffic signals to roundabouts (in the UK the standard is TD 50 (DMRB 6.2.3)): * https://en.wikipedia.org/wiki/Roundabout#Signalised_roundabouts https://en.wikipedia.org/wiki/Roundabout#Signalised_roundabo... * http://www.jctconsultancy.co.uk/Consultancy/roundabouts.php http://www.jctconsultancy.co.uk/Consultancy/roundabouts.php * https://assets.publishing.service.gov.uk/media/5e81b669e90e0706f8976d09/ltn-1-09_Signal_controlled_roundabouts.pdf https://assets.publishing.service.gov.uk/media/5e81b669e90e0... If one direction dominates, you can stop it and then let the others have a turn.