In the Netherlands at least, if you can't find a spot to merge from the onramp lane, you are to stop and wait for a better moment to merge. This never happens i

In the Netherlands at least, if you can't find a spot to merge from the onramp lane, you are to stop and wait for a better moment to merge. This never happens in practice though, because drivers on the rightmost lane will commonly either move a lane to the left, or if they can't, change their speed a little to accommodate you. But that's a courtesy, not a rule.