Why is it easier for pedestrians to cross a single one-way lane of traffic, than a two-way road?

Of these the latter is far simpler and allows a pedestrian to deal only with traffic approaching from one direction. If vehicles are in a single lane, then a pedestrian need only to be certain that a single driver has stopped before they can have the certainty that it is safe to cross. Where a crossing crosses a two-way road but there is a pedestrian refuge at the centre of the road, then the road is effectively two one-way roads.

1.
Four lanes, two in each direction
No pedestrian refuge
Pedestrians wait for four vehicles to stop, approaching from two directions
2.
Four lanes, two in each direction
With pedestrian refuge
Pedestrians wait for two vehicles to stop approaching from
one direction
3.
Two lanes,one in each direction
No pedestrian refuge
Pedestrians wait for two vehicles to stop approaching from two directions
4.
Two lanes,one in each direction
With pedestrian refuge
Pedestrians wait for one vehicle to stop

5.
One lane
Pedestrians wait for one vehicle to stop

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