Final answer:
The lane marker on a two-way street is typically white in most countries. They help drivers stay in their lanes and maintain a safe distance from oncoming traffic.
Step-by-step explanation:
In most countries, the lane marker on a two-way street is white. White lane markers indicate that traffic flows in the same direction. On a two-way street, there will typically be two white lane markers, one on each side of the center line. These lane markers help drivers stay in their respective lanes and maintain a safe distance from oncoming traffic.