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Atlist is the easy way to create maps with multiple markers.
[{"featureType":"road.highway","elementType":"geometry.fill","stylers":[{"visibility":"simplified"}]},{"featureType":"road.highway","elementType":"geometry.stroke","stylers":[{"visibility":"on"}]},{"featureType":"road.highway","elementType":"labels.text.fill","stylers":[{"visibility":"on"}]}]