It’s an incredible piece of hardware and a big job from engineers but common people just call it “the zipper”.

It changes the direction of the highway lanes at 5 mph. and can give one extra lane to commuters going to the downtown every morning or in the way back to home. Them all are happy with the new lane because it gives them 20 minutes less of driving time so they can be sleeping, having a breakfast with the kids or simply living their life.

Caltrans can increase the capacity ot its highways wih a samall investment far away of the incredible cost of modify an highway in a densely populated area so ¡everybody is happy with the zipper!

You can see it working in the next video.

Caltrans zipper