Merge of Doom

I am usually a good driver, but there is one situation I often find dangerous, the lane merge. I hate when you are driving along, and suddenly the line between lanes disappears and two lanes merge quickly into one. They never give enough notice (sometimes none) and you have to make quick action to avoid merging into another car.

I have a simple solution. Why don't they use a special lane marker paint pattern that indicates the lanes are about to merge. Like this: