On highway entry ramps with two lanes, how do engineers decide which lane into the other?

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On highway entry ramps with two lanes, how do engineers decide which lane into the other?

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The usual case is for the right lane to merge into the left lane. There are exceptions, but this is by far the most common method in the USA.

My apologies but I don’t understand your question. Can you provide more detail, please?

They’re all supposed to have the right lane merge going left (because the driver is on the left and has a better view on that side) but some states still have older designs in use and haven’t upgraded them to modern standards.