Overview:

Return a number that represents a route based on currently selected mode from the "mode" gui.

In-dept:

Starts from line 278 in NetLogo, the new-route is a procedure that simply look into the currently selected mode from "mode" gui and call another procedure accordingly. It waits for that procedure to a number that represent a route(top, middle, or bottom) and simply use that result to assign the route to the commuter where it gets called within the spawn-commuters procedure at line 123.

Welcome for any addition, correction, and suggestion!