Some countries that drive on the left side of the road aren't island countries (although most are; the most notable exception is India). For those countries, how do people laying out roads for drivers deal with switching the side of the road that they drive on? I imagine expecting drivers to simply cross over the middle of the road might cause problems.
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In high traffic areas, it is usually done with with bridges that cross over and swap the sides.
This is the Lotus bridge in Macau
This is the proposed Pearl River Necklace bridge, which perhaps illustrates the concept the best.
Medium traffic areas are usually done with an intersection that may include traffic lights.
This is the traffic light crossing at the Thai-Lao Friendship Bridge.
Very low traffic areas are usually done with signs only.
This is a sign post on the Karakoram Highway over Khunjerab Pass between China and Pakistan