> They are a liability when traffic levels are high enough - say during peak times - when one inbound direction is blocked by another.
The rule should be that when traffic is bumper to bumper, the "zip" is made mandatory. That rule already supersedes the normal rule on, say, many (all?) european highways when the highway goes from, say, 3 lanes to 2 lanes and in case that creates a traffic jam: people in "their" lane doesn't have the right of way anymore. It's one car from one lane, one car from another lane: the "zip".
People in a roundabout should lose their right of way when traffic is bumper to bumper.
Where I live people are extremely polite on the road so I don't even know if the zip it's mandatory: people shall simply act that way.
In countries where road rage is common and people misbehave, like France, just make it mandatory by law.
The zip does nothing on the roundabout.
bumper to bumper is very-rare, and it mostly happens momentarily due to pedestrian crossings placed directly after the entrance/exit of the roundabout.
What is actually super dangerous are the non-standard 2/3 lane roundabouts where the first lane gets "ejected" at the next/second exit forcibly, while the 2nd lane can either exit or continue on the roundabout, so many lorries in the 1st lane try to runover those in the 2nd lane trying to exit.
I'm in France and we do Zip in my area (which is quite touristic and see huge traffic right now, so I do that quite often when I drive in summer). But it is true that around Paris and in southeast France, people usually misbehave and act like entitled pricks.
The rule should be that when traffic is bumper to bumper, the "zip" is made mandatory. That rule already supersedes the normal rule on, say, many (all?) european highways when the highway goes from, say, 3 lanes to 2 lanes and in case that creates a traffic jam: people in "their" lane doesn't have the right of way anymore. It's one car from one lane, one car from another lane: the "zip".
People in a roundabout should lose their right of way when traffic is bumper to bumper.
Where I live people are extremely polite on the road so I don't even know if the zip it's mandatory: people shall simply act that way.
In countries where road rage is common and people misbehave, like France, just make it mandatory by law.