The tricky part is that a lot of people think they need to merge early when they see the arrow sign, but that creates one dense line of traffic and leads to longer backups when traffic is heavy.

Many drivers, when they see a “lane closed ahead” sign, move over right away ... encourage drivers to late merge, or zipper merge, when traffic is heavy. Utah has even made it the law.

LA traffic sucks, but a video shared by Twitter ... she's even witnessed a driver eating corn on the cob before. The merging sign has been quite the hit on Twitter, and people are truly thankful ...

Drivers will find themselves bumper to bumper for a ways back before the lanes merge. "One thing that really helps with traffic control is if people will do what's called zipper merging," said Buffat.