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Many years ago we had some wide roads around here with a third lane in the middle. This was obviously an overtaking lane for traffic in either direction (no solid white lines) but people used to enter it, without any thought that someone else also might want to use it coming in the other direction. Several accidents ensued, so eventually the authorities replace the third lane with two wide lanes and a broken cross hatch in the middle....it solved the problem of risky overtakes overnight. People could still overtake on them but it stopped the "lemmings".
Two lanes to drive in, one lane to die in!
On the other hand, back in the 80's I remeber a streach of road beyween reading and oxford which was basically very wide SC. It was actually wide enough to be marked as a "No central reservation DC" IYSWIM.
As a result, one could overtake safely in both directions simultainioulsy. interestingly the road dicipline was typically excellent. Drivers who were not overtaking would keep well over to the left to allow overtaking drivers the room to do so.
Maybe all trunk roads should be built this way. takes up less space than conventional DC but provides nearly all the same advantages + a greater tendency for people to "Keep left unless overtaking" than occurs with segregated lanes.