How do I make the car switch between 3 lanes, not 4?

Hi guys, could you help me make the car switch between 3 lanes (one should be in the very center of the screen, the other more to the left, and the last one more to the right), not 4 as it is the default in this "Car lanes" template?

the file of the game:

drive.google.com/file/d/1Bb8Ll1De5DD3MkEBEDy0EVnTGewAy-tO/view

3 lanes right?

dropbox.com/s/bjvw5t2cihdg8so/Car%20lanes.c3p

Looks like alextro got to it first but I'll throw my edit in here anyway. I changed the movement and roads to 3 lanes and made all cars travel in the same direction. I also changed the frequency at which they spawn to adjust for losing the 4th lane.

https://drive.google.com/file/d/1OAYkma1tzP8e7m3DfRyfSD2vm0bo969v/view?usp=share_link