In the eastern part of the US you can hardly go anywhere without paying tolls. They have a system called Easy Pass or something like that. Vehicles have some sort of electronic device that is detected as they drive through the toll lane - they can go through pretty fast. I think Mexico now has something similar though I know next to nothing about either system. There are lanes that are reserved specifically for these vehicles and only these vehicle so they do not have to slow down as they zip through the toll. Other vehicles in that lane would slow the whole process. You must watch carefully as you approach the caseta de cobro to make sure you are in the correct lane. The "Easy Pass" (or whatever it is called in Mexico) is usually the right lane. Aiming for a middle lane is usually a safe bet.
We drove the new west loop of the Arco Norte yesterday. It is a disgrace. It is 2 lanes of rough surface. They are doing the earth moving work for another 2 lanes - I hope they have different contractors. The road surface does not have a lot of potholes yet but you can see cracks almost everywhere on the road - and the cracks are big enough that we feel every one of them as we bounced down the road. The only explanation I can come up with is they could have been in such a rush to open the road they did not put a finish layer on top of the base layer - sounds ridiculous but I can't believe what we were driving on was finished. We got of Arco Norte and drove west on a nice smooth 15D - at least it was nice most of the way to Morelia where we got off. Parts of the rest of the Arco Norte (especially the entrance/exit ramps) was also in rough shape.
We drove the entire Arco Norte from Puebla to the 15D connection and the toll for our Bus towing our car was $693mx ($40+ ? US) - the rate for 4 ejes on the rate sign.